Rotoscoping is one of the most tedious jobs I remember doing in the early days (I won't say how early) of Adobe AfterEffects.

From Wikipedia:

Rotoscoping is an animation technique that animators use to trace over motion picture footage, frame by frame, to produce realistic action. Originally, live-action movie images were projected onto a glass panel and traced onto paper. This projection equipment is referred to as a rotoscope, developed by Polish-American animator Max Fleischer.[1] This device was eventually replaced by computers, but the process is still called rotoscoping.

I was paid over 2 weeks, quite well, though one can lose one's mind to rotoscope about 20 seconds of footage. At 30fps, that's 600 frames. I had to go frame by frame to make the various mattes, set the feathering, looks for edges and more. I could probably give a better description and detail but the job really gutted my deep interest in pursuing this skill as a career.

Leaping forward to today, the world of rotoscoping with AI capabilities can now do the job incredibly fast. AfterEffects is not as expensive as high end software like Nuke and Flame, etc., but financially accessible to creators everywhere.

Watch this video. The guy is pretty darn good at explaining and highly entertaining too.