As much as I wanted to believe it was real, I'm pretty sure that video is faked. It's just a doll's arm or something. The only time you see the kid's fingers move is the shots where he's filling in solid areas or "blending." I'm sure they sped it up so it wouldn't look as fake. Plus the site at the end of the video (turtlekid.com) is to promote the new movie.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects