void Start()
 {
     screenRect = new Rect(0, 0, Screen.width, Screen.height);
     camTexture = new WebCamTexture();
     camTexture.requestedHeight = Screen.height;
     camTexture.requestedWidth  = Screen.width;
     MC = GameObject.Find("Main Camera");
     MC.GetComponent <UnityARVideo>().enabled = false;
     ARC = GameObject.Find("ARCameraManager");
     ARC.GetComponent <UnityARCameraManager> ().enabled = false;
     if (camTexture != null)
     {
         camTexture.Play();
     }
 }
 void OnGUI()
 {
     if (url != "")
     {
         return;
     }
     // drawing the camera on screen
     GUI.DrawTexture(screenRect, camTexture, ScaleMode.ScaleToFit);
     // do the reading — you might want to attempt to read less often than you draw on the screen for performance sake
     try {
         IBarcodeReader barcodeReader = new BarcodeReader();
         // decode the current frame
         var result = barcodeReader.Decode(camTexture.GetPixels32(), camTexture.width, camTexture.height);
         if (result != null)
         {
             Debug.Log("DECODED TEXT FROM QR: " + result.Text);
             url = result.Text;
             camTexture.Stop();
             MC.GetComponent <UnityARVideo>().enabled           = true;
             ARC.GetComponent <UnityARCameraManager> ().enabled = true;
         }
     } catch (System.Exception ex) { Debug.LogWarning(ex.Message); }
 }