Guess it was a while ago that I watched that… Anyway the technique is the same.
1) grab a still frame in photoshop and paint it up!
2) save it out without the background (You just want the paint strokes)
3) import this into AE and put it over your footage.
4) track with mocha. It’s great at faces and skin!
5) apply the “corner pin” data to your paintstrokes layer from PS.
Look up basic Mocha tutorials if you don’t know how to use it. It’s the best tracker out there, and I’ve used a ton of them. And it comes free with AE!
As a suggestion – if you use this technique break your track/paint layers up into as many patches as you need. You’re definitely not going to get it in one layer, particularly if the face is moving. And Mocha works on FLAT PLANES. Unfortunately faces are not generally flat, but if the motion isn’t too great it should still work – just break it down as much as you have to (right cheek, left cheek, nose, forehead, chin, upper lip, etc.)
– Spencer