code: public boolean performTracking(  PyramidKltFeature feature ) {
  
  		KltTrackFault result = tracker.track(feature);
  
  		if( result != KltTrackFault.SUCCESS ) {
  			return false;
  		} else {
  			tracker.setDescription(feature);
  			return true;
  		}
  	}
docs: Updates the track using the latest inputs.  If tracking fails then the feature description
  in each layer is unchanged and its global position.
  
  @param feature Feature being updated
  @return true if tracking was successful, false otherwise