I highly doubt AI is being used here to match up the Open Camera footage with the instagram pic. Identifing humans as an object within a frame is trivial. Identifying individuals requires a considerable amount of custom training which is more than what is available from an instagram pic and a few video frames. I'm not saying it can't be done, it's just not that easy. I'd bet $100 bucks that most, if not all, of these matches were accomplished using good old stalking (matching post times to manually reviewing video data). Would be happily proven wrong but without any source code provided I stand firm with my opinion.