code: function ( tracker, gPoint ) {
              var guid = _generateGuid( tracker, gPoint ),
                  i,
                  len = trackerPoints.length;
              for ( i = 0; i < len; i++ ) {
                  if ( trackerPoints[ i ].guid === guid ) {
                      trackerPoints.splice( i, 1 );
                      // Only run the interval timer if theres gesture pointers to track
                      len--;
                      if ( len === 0 ) {
                          window.clearInterval( intervalId );
                      }
                      break;
                  }
              }
          }
docs: Public. Stop tracking a gesture point