This takes you way down the wrong rabbit hole, but maybe you can get the idea:
www.tomshardware.com/how-to/raspberry-pi-facial-recognition
But if it can recognize faces it has to separate them from the surroundings, and if t can discriminate friends from random strangers it should be able to discern relative velocities.
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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