Just a little snippet I'm using right now. If you need to clone from a certain area in plate but don't want to stabilize it and use a tracker as clone transform base instead, changing time offset of clone source shifts the area you are cloning from. To keep the same relative clone source area while changing time offset, use this expression in clone shape or stroke source transform:
Tracker1.tracks.3.track_x-Tracker1.tracks.3.track_x(frame+source_time_offset)
It allows easy changes in time offset and still clones from the same relative location.
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