How does Lukas kanade optical flow and goodFeaturesToTrack works?

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Seriously, you have plenty of information on Internet... The reference links:

• Pyramidal Implementation of the Lucas Kanade Feature Tracker Description of the algorithm
• Good Features to Track

Basically, GoodFeatureToTrack function computes Harris corner scores at every pixel in the image. Then it thresholds these scores to produce good features to track. What is Harris corner score, pls look at this http://en.wikipedia.org/wiki/Corner_d.... LK optical flow is quite long story to explain. You can look up it on Internet.