The picture from the unity camera stops coming - unity3d

Question

My application needs to use the camera (camera from the phone), but when I run it on the phone, a request appears to access the camera. After I click on the consent button, the image does not come. For it to arrive, you need to restart this scene.
I am using this script:
using System.Collections;
using System.Collections.Generic;
using System;
using UnityEngine;
using UnityEngine.UI;
using ZXing;
using UnityEngine.SceneManagement;
using Newtonsoft.Json.Linq;
public class QRScanner : MonoBehaviour
{
WebCamTexture webcamTexture;
string QrCode = string.Empty;
void Start()
{
var renderer = GetComponent<RawImage>();
webcamTexture = new WebCamTexture(512, 512);
renderer.material.mainTexture = webcamTexture;
StartCoroutine(GetQRCode());
}
IEnumerator GetQRCode()
{
IBarcodeReader barCodeReader = new BarcodeReader();
webcamTexture.Play();
var snap = new Texture2D(webcamTexture.width, webcamTexture.height, TextureFormat.ARGB32, false);
while (string.IsNullOrEmpty(QrCode))
{
try
{
snap.SetPixels32(webcamTexture.GetPixels32());
var Result = barCodeReader.Decode(snap.GetRawTextureData(), webcamTexture.width, webcamTexture.height, RGBLuminanceSource.BitmapFormat.ARGB32);
if (Result != null)
{
QrCode = Result.Text;
if (!string.IsNullOrEmpty(QrCode))
{
Debug.Log("DECODED TEXT FROM QR: " + QrCode);
var json = JObject.Parse(QrCode);
var Monument = (string) json["Name"];
var City = (string) json["City"];
DataHolders.Monument = Monument;
DataHolders.City = City;
break;
}
}
}
catch (Exception ex) { Debug.LogWarning(ex.Message); }
yield return null;
}
webcamTexture.Stop();
SceneManager.LoadScene(3);
}
}
How can I make the image go after gaining access to the camera?

Answer 1

You need to Ask for permission runtime and once you get the permission you need to call GetQRCode()
On android you could do something like following
private bool hasCameraPermission = false;
WebCamTexture webcamTexture;
string QrCode = string.Empty;
void Start()
{
var renderer = GetComponent<RawImage>();
webcamTexture = new WebCamTexture(512, 512);
renderer.material.mainTexture = webcamTexture;
}
private void Update() {
if (!Permission.HasUserAuthorizedPermission(Permission.Camera)) {
Permission.RequestUserPermission(Permission.Camera);
}
else {
// here you will have camera permission
if (!hasCameraPermission) {
hasCameraPermission = true;
StartCoroutine(GetQRCode());
}
}
}
IEnumerator GetQRCode() {
...
}