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Apply GoodFeaturesToTrack on a rect.

I thinking of using Haarcascades to detect faces, and there after improve tracking using the GoodFeaturesToTrack to track. I am just wondering how i should do it.. I mean the idea of using the Haar cascades is to narrow down the area I apply the GoodFeatureToTrack, i mean the function only give me some points, and how do i use those to track a face?