void OnDestroy()
        {
#if UNITY_ANDROID && !UNITY_EDITOR
            this.androidCameraActivity.Call("closeCamera");
#else
            VisageTrackerNative._closeCamera();
#endif
        }
        public void StopCamera()
        {
#if UNITY_ANDROID && !UNITY_EDITOR
            this.androidCameraActivity.Call("closeCamera");
#else
            VisageTrackerNative._closeCamera();
#endif
            isTracking = false;
        }