Just last week I added 2 car cams to our system. One was under 20 bucks and is #1 on Amazon's best seller's list. The other was about 100 and is a 1080p system. These are pretty small self contained and could be powered from a common USB power adapter. They record on a loop so you can set it up and let it run until you need the video.

The usual trackers require GPS so indoors that's a no-go.
Bob