title: keep object after find tracker in vuforia with unity
body: <p>please help me i faced the problem
  I write a application with unity3d and vuforia that play video after detect the tracker , i want to fix video after detection in the camera and stop tracking , i edit onTrackingFound and onTrackingLost methods in TrackableEventHandler.cs several time but i cannot solve it , please help me to find a solution . thank a lot my frinds. 
  the onTrackingFound  method is :</p>
  
  <pre><code>private void OnTrackingFound()
  {
      Renderer[] rendererComponents = GetComponentsInChildren&lt;Renderer&gt;();
      Collider[] colliderComponents = GetComponentsInChildren&lt;Collider&gt;();
  
      // Enable rendering:
      foreach (Renderer component in rendererComponents)
      {
          component.enabled = true;
      }
  
      // Enable colliders:
      foreach (Collider component in colliderComponents)
      {
          component.enabled = true;
      }
  
      Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " found");
  
      // Optionally play the video automatically when the target is found
  
      VideoPlaybackBehaviour video = GetComponentInChildren&lt;VideoPlaybackBehaviour&gt;();
      if (video != null &amp;&amp; video.AutoPlay)
      {
          if (video.VideoPlayer.IsPlayableOnTexture())
          {
              VideoPlayerHelper.MediaState state = video.VideoPlayer.GetStatus();
              if (state == VideoPlayerHelper.MediaState.PAUSED ||
                  state == VideoPlayerHelper.MediaState.READY ||
                  state == VideoPlayerHelper.MediaState.STOPPED)
              {
                  // Pause other videos before playing this one
                  PauseOtherVideos(video);
  
                  // Play this video on texture where it left off
                  video.VideoPlayer.Play(false, video.VideoPlayer.GetCurrentPosition());
              }
              else if (state == VideoPlayerHelper.MediaState.REACHED_END)
              {
                  // Pause other videos before playing this one
                  PauseOtherVideos(video);
  
                  // Play this video from the beginning
                  video.VideoPlayer.Play(false, 0);
              }
          }
      }
  
      mHasBeenFound = true;
      mLostTracking = false;
  }
  </code></pre>
  
  <p>and the onTrackingLost method is :</p>
  
  <pre><code>private void OnTrackingLost()
  {
      Renderer[] rendererComponents = GetComponentsInChildren&lt;Renderer&gt;();
      Collider[] colliderComponents = GetComponentsInChildren&lt;Collider&gt;();
  
      /*
      // Disable rendering:
      foreach (Renderer component in rendererComponents)
      {
          component.enabled = false;
      }
  
      // Disable colliders:
      foreach (Collider component in colliderComponents)
      {
          component.enabled = false;
      }
      */
      Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " lost");
  
      mLostTracking = false;
      mSecondsSinceLost = 0;
  }
  </code></pre>