I believe you are referring


I believe you are referring to motion tracking. Animating an object to track, solve or follow another object within a scene. Adobe After Effects and Hit Films have this feature. Not sure if Sony Vegas has the feature. You can do a fairly decent job manually frame by frame ( rotoscoping) in Vegas if only a short amount of frames. Adjusting the location of the object as the target object moves. Perhaps a Vegas pro here can guide you better.

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