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Another alternative is to use Haar classifier for pedestrian detection, assuming your "people" are either standing or moving, see this link that includes some discussion about it. I have tried the classifiers myself and movement + Haar-detection + Kalman tracking works relatively ok as long as:

1. there are not too many pedestrians on the scene, and they don't oclude each other,
2. the pedestrians don't look too small in the image (camera too far)
3. the background is not too cluttered with objects looking like pedestrians :)