private void RemoveVuforiaScript(ARCamera go)
        {
            VuforiaTrackablesTracker node = go.GetComponent <VuforiaTrackablesTracker> ();

            if (node != null)
            {
                DestroyImmediate(node);
            }
        }
        private void AddVuforiaScript(ARCamera go)
        {
            VuforiaTrackablesTracker node = go.GetComponent <VuforiaTrackablesTracker> ();

            if (node == null)
            {
                go.gameObject.AddComponent <VuforiaTrackablesTracker> ();
            }
        }