alright, a few things:

-if you are filming at a protest, avoid faces. if you get faces, don't post the footage immediately, there are multiple free face blurring apps on all smartphone platforms, or take it home and do it in your editor of choice

-consider not filming

i spent a lot of time filming protests in 2014, trying to document them, thinking it was helpful. i was wrong: the people who hired me didnt want to do the story right, so i instead ghosted them (didnt get paid ofc, nor should i have been). i wish just protested.

exposure is important, showing people what is going on is important, documenting police abuse is important. but- you also have to understand images are a weapon, in fact one of the most powerful weapons the state has at its disposal. you can wind up as a useful idiot for the feds

further-- and this was, to be clear, something i was *extremely* oblvious about when i was younger, it just makes protestors incredibly uncomfortable, and with good reason! the risks are fucking serious

honestly its a huge factor in why the stop & shop full doc hasnt really fully materialized (yet)-- i dont want to put people at risk for talking about this. there are consequences to this, for people who are already vulnerable. you really gotta be careful. i do too.

anyways, if you insist on it: go and torrent a copy of Premiere Pro, use the Gaussian Blur effect on faces with an oval shaped mask, track it across people's movement using keyframes. "waah that's so much work" no shit it is. i dont care https://helpx.adobe.com/premiere-pro/how-to/blur-face-masking-tracking.html