To avoid misunderstandings, I think there's yet need for a description:
As I said in the first post, this is a short film, not a game trailer or something. What the artist did was taking the speed run of a player from
Super Mario Bros 3 (I think, this sequence is the one he used)
and then recreated everything frame by frame in a 3D environment using lots of render passes (the rendering alone, if done on a single computer, would have lasted 50 days)
Here's a
video.