text: Most video codecs, like the one in your webcam, use a system of compression that counts on sameness. That is, it only reports that the video needs to change if it percieves a substantial change, like your subject moving.  You might be able to use a webcam or similiar, and write a little code, perhaps in visual basic, that would exploit this trick. Have it give your turret X,Y coordinates of the originally chosen weirdo in red, and stay with that red.\n\nI've seen this implemented on digital cameras for focus tracking.\n\n\nGood luck, this is a doozy.