code: function getEvents(duration){
  
      if (gazeCallback == null){
  
          return [];
      
      }
  
      let gaze = gazeCallback();
  
      if (!gaze){
  
          return [];
  
      }
  
      const extra = {
          'ik': ['Time'],
          'iv': [utils.getDataPointDuration(duration)],
          'fk': [],
          'fv': []
      };
  
      return [['vadrGaze', gaze, extra]];
  
  }
docs: returns array of all the position related events with extra info and filters
  @memberof GazeCollector
  @returns event with with extra key info dict