Introduction - If you have any usage issues, please Google them yourself
Lucus-Kanade Tracker
this implemented the classical Lucas-Kanade Tracker described in the paper:
An Iterative Image Registration Technique with an Application to Stereo Vision (IJCAI), B.D. Lucas and T. Kanade, 7th International Joint Conference on Artificial Intelligence (IJCAI), April, 1981, pp. 674-679.