/// <summary>Start Tracker.</summary>
 /// <param name="trackerType">Bit mask of tracker type.</param>
 public void StartTracker(int trackerType)
 {
     if (trackerType == TRACKER_TYPE_CLOUD_RECOGNIZER)
     {
         cloudRecognitionController = CloudRecognitionController.Instance;
         cloudRecognitionController.setCloudRecognitionSecretIdAndSecretKey(this.secretId, this.secretKey);
         cloudRecognitionController.startTracker();
     }
     else
     {
         NativeAPI.TrackerManager_startTracker(trackerType);
     }
 }