content: from SimpleCV.Tracking.TrackClass import Track, CAMShiftTrack, SURFTrack, LKTrack, MFTrack
  from SimpleCV.Tracking.CAMShiftTracker import camshiftTracker
  from SimpleCV.Tracking.LKTracker import lkTracker
  from SimpleCV.Tracking.SURFTracker import surfTracker
  from SimpleCV.Tracking.MFTracker import mfTracker
  from SimpleCV.Tracking.TrackSet import TrackSet