In theory, someone with enough technical skills could create a script that tracks which IP is downloading which video. In practice, this is much more difficult because:
It is free and open-source software, under <x id="START_LINK" ctype="x-a" equiv-text="<a href="https://github.com/Chocobozzz/PeerTube/blob/develop/LICENSE">"/>AGPLv3 licence<x id="CLOSE_LINK" ctype="x-a" equiv-text="</a>"/>.