It's the Attack of the YouTube videos! (Anyone still watching G4 TV might get a chuckle out of that. I think.)
This video seems to have been posted by Paul Baumgaertner, just in time for Halloween. Paul is the most well-known creator of a TRON costume, after Jay "The TRON Guy" Maynard.
In the video, we see his appearance on The Screen Savers from a couple of years ago, while in costume. This was back when The Screen Savers was still on G4, and Kevin Rose was still a host. (Damn you, Comcast, for ruining TechTV!) Jay's costume is also briefly talked about.