Like Deja Vu ( https://www.youtube.com/watch?v=_NPG1RNhrsM ), The Dark Knight's sonar ( https://www.youtube.com/watch?v=IRELLH86Edo ) or the series Devs.

I've always thought it'd be amazing to be able to view an event from different angles via crowd-sourced videos, and that it was very doable. From an information scientist point of view, I'm glad to see it's been done.