The other week I followed the footsteps of Cassie Tarakajian's Creative Coding in p5.js and used clmtracker to play around with face-tracking (and wiring it up to responsive sound generator.)
You can play with the final results here. I write up the process on my devblog - it was more frustrating than I expected to get the library installed and understand it, and the end results were a bit disappointing - the face tracker doesn't work well with glasses, for starters. Still it's fun to know I have these kind of options at hand for future creative coding goofery. starters.