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v.track

v.track follows a specified small object across the video field with sub-pixel accuracy and no delay.


v.track follows a specified small object across the video field with sub-pixel accuracy and no delay. Objects are tracked best against a contrasting solid background, and will be lost if they travel faster than 8 pixels per frame. You can also tell v.track to track an unmoving part of the screen, and move the camera (instant steadicam) (Again, if the camera moves such that the image moves more than 8 pixel per frame, you will lose tracking.) If you supply a profile stream (i.e. from v.silhouette’s second outlet), v.track uses the silhouette to define a mask that will cause areas showing no silhouette presence to be ignored in the tracking process, which improves tracking across complicated backgrounds. v.track is best understood by looking at the v.track examples, because it works best when supplied with properly pre-processed streams.
from the library :
softVNS
Format : External
Environment : jitter / max
commercial
Max 4.x


http://homepage.mac.com/davidrokeby/softVNS.html

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