добавил немного функционала

Assets/Scripts/GameSystem.cs

@@ -0,0 +1,56 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class GameSystem : MonoBehaviour
+{
+    public static GameSystem Instance { get; private set; }
+    public List<IGameComponent> gameComponents { get; private set; } = new List<IGameComponent>();
+
+    public void AddGameComponent(IGameComponent component)
+    {
+        if(!gameComponents.Contains(component))
+            gameComponents.Add(component);
+    }
+
+    void Awake()
+    {
+        Instance = this;
+    }
+
+    void Start()
+    {
+        GameSystem[] gameSystems = FindObjectsOfType<GameSystem>();
+        if(gameSystems.Length > 1)
+        {
+            Destroy(this.gameObject);
+            return;
+        }
+
+        DontDestroyOnLoad(this);
+    }
+
+    void Update()
+    {
+        for(int i = 0; i < gameComponents.Count; i++)
+            gameComponents[i].OnUpdate();
+    }
+
+    void FixedUpdate()
+    {
+        for(int i = 0; i < gameComponents.Count; i++)
+            gameComponents[i].OnFixedUpdate();
+    }
+
+    void LateUpdate()
+    {
+        for(int i = 0; i < gameComponents.Count; i++)
+            gameComponents[i].OnLateUpdate();
+    }
+
+    public void RemoveGameComponent(IGameComponent component)
+    {
+        if(gameComponents.Contains(component))
+            gameComponents.Remove(component);
+    }
+}

Assets/Scripts/GameSystem.cs.meta

@@ -1,5 +1,5 @@
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Assets/Scripts/HolographicEffectHandler.cs

@@ -1,14 +0,0 @@
-using System.Collections;
-using System.Threading.Tasks;
-using System.Collections.Generic;
-
-using UnityEngine;
-using DG.Tweening;
-
-public class HolographicEffectHandler : MonoBehaviour
-{
-    void Start()
-    {
-        
-    }
-}

Assets/Scripts/InputHandler.cs

@@ -0,0 +1,54 @@
+using System.Collections;
+using System.Collections.Generic;
+
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+public class InputHandler : MonoBehaviour, IGameComponent
+{
+    private Controls inputSystem;
+    private Transform cameraTransform;
+
+    void Awake()
+    {
+        inputSystem = new Controls();
+        cameraTransform = transform;
+    }
+
+    void Start()
+    {
+        GameSystem.Instance.AddGameComponent(this);
+    }
+
+    void OnEnable()
+    {
+        inputSystem.Enable();
+        InputSystem.EnableDevice(UnityEngine.InputSystem.AttitudeSensor.current);
+    }
+
+    void OnDisable()
+    {
+        InputSystem.DisableDevice(UnityEngine.InputSystem.AttitudeSensor.current);
+        inputSystem.Disable();
+    }
+
+    public void OnUpdate()
+    {
+        var phoneRotation = inputSystem
+            .Rotation
+            .Gyroscope
+            .ReadValue<Quaternion>();
+
+        cameraTransform.rotation = phoneRotation;
+        cameraTransform.Rotate(0, 0, 180, Space.Self);
+        cameraTransform.Rotate(90, 180, 0, Space.World);
+    }
+
+    public void OnFixedUpdate() { }
+    public void OnLateUpdate() { }
+
+    public void OnDestroy()
+    {
+        GameSystem.Instance.RemoveGameComponent(this);
+    }
+}

Assets/Scripts/InputHandler.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/Interfaces.meta

@@ -0,0 +1,8 @@
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+folderAsset: yes
+DefaultImporter:
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Assets/Scripts/Interfaces/IGameComponent.cs

@@ -0,0 +1,7 @@
+public interface IGameComponent
+{
+    public void OnUpdate();
+    public void OnFixedUpdate();
+    public void OnLateUpdate();
+    public void OnDestroy();
+}

Assets/Scripts/Interfaces/IGameComponent.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/QRCodeReader.cs

@@ -0,0 +1,108 @@
+using System.Linq;
+using System.Collections;
+using System.Collections.Generic;
+
+using ZXing;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class QRCodeReader : MonoBehaviour
+{
+    [SerializeField] AspectRatioFitter aspectRatioFitter;
+    [SerializeField] RawImage rawImage;
+    [SerializeField] GameObject scanFrame;
+
+    private WebCamTexture camTexture;
+    private Coroutine c_QRScanningRoutine;
+
+    void Start()
+    {
+        int backCameraId = 0;
+        bool backCameraEnabled = false;
+        List<int> backCameraIDs = new List<int>();
+
+        WebCamDevice[] devices = WebCamTexture.devices;
+        if(devices.Length != 0)
+        {
+            for(int i = 0; i < devices.Length; i++)
+            {
+                if(Application.platform == RuntimePlatform.Android && !devices[i].isFrontFacing)
+                {
+                    backCameraEnabled = true;
+                    backCameraIDs.Add(i);
+                }
+                else
+                {
+                    backCameraEnabled = true;
+                    backCameraId = 0;
+                }
+            }
+
+            if(backCameraIDs.Count != 0)
+                backCameraId = backCameraIDs.First();
+        }
+
+        if(!backCameraEnabled) return;
+
+        camTexture = new WebCamTexture(devices[backCameraId].name);
+        rawImage.texture = camTexture;
+        camTexture.Play();
+
+        int orientation = -camTexture.videoRotationAngle;
+        rawImage.rectTransform.localEulerAngles = Vector3.forward * orientation;
+
+        var ratio = (float)camTexture.width / (float)camTexture.height;
+        aspectRatioFitter.aspectRatio = ratio;
+
+        float scaleY = camTexture.videoVerticallyMirrored ? -1f : 1f;
+        rawImage.rectTransform.localScale = new Vector3(1f, scaleY, 1f);
+
+        ScanningQRCode();
+    }
+
+    public void ScanningQRCode()
+    {
+        if(c_QRScanningRoutine != null)
+        {
+            StopCoroutine(c_QRScanningRoutine);
+            c_QRScanningRoutine = null;
+        }
+
+        c_QRScanningRoutine = StartCoroutine(ScanQRCode());
+    }
+
+    IEnumerator ScanQRCode()
+    {
+        Result result;
+
+        while(true)
+        {
+            try
+            {
+                IBarcodeReader barcodeReader = new BarcodeReader();
+                result = barcodeReader.Decode
+                (
+                    camTexture.GetPixels32(),
+                    camTexture.width,
+                    camTexture.height
+                );
+
+                if(result != null)
+                {
+                    break;
+                }
+            }
+            catch
+            {
+
+            }
+
+            yield return new WaitForSeconds(1f);
+        }
+
+        camTexture.Stop();
+        Debug.Log(result.Text);
+        gameObject.SetActive(false);
+        scanFrame.SetActive(false);
+    }
+}

Assets/Scripts/QRCodeReader.cs.meta

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