Unfortunately a lot of the mods to make it happen are designed to not be noticed by the DMV inspectors. It’s a whole industry committed to industriously dumping as much soot into the atmosphere. If only that industriousness could be used for good; good doesn’t make as much money or “own the libs” as much as obnoxiously killing the Earth, I guess.

Short answer, it’s not. It’s effectively legal because the circle Venn Diagram of those who would roll coal and have Punisher/Back the Blue stickers on their trucks and absolutely zero enforcement, but it’s TECHNICALLY illegal.

Vaguely ask and you shall receive: https://imgur.io/gallery/YPHY0

My 2¢: kdenlive works (worked; been a few years) shockingly well for being free without a commerical version. It’s not polished or fancy like commercial solutions, and it has had stability issues, but it really does work. Someone better than me could get professional results out of it.