Given that this event was covered by many Western journalists at the time, there has to be more pictures and videos of it out there right?
There is a documentary called The Gate of Heavenly Peace, which has been generally considered as pretty neutral and objective. It is about 3 hours long in total, available on YouTube:
Part 1: https://youtu.be/1Gtt2JxmQtg
Part 2: https://youtu.be/o0lgc4fWkWI
I'm not sure if this answer meets the requirements of AskHistorians, but OP did ask for footages.
EDIT: 3 hours long, not 4