I think david's correct, the guy in the video spent some serious time woodshedding...that's not an easy tenchique at all, well, mechanically it is simple...but to do it in a musical context and keep both your hands in perfect sync with eachother is very demanding.
Not the same technique, but take a look at how to play a raked triplet pattern, let this video be a lesson on the dangers of hard drugs:
http://www.youtube.com/watch?v=AILLXh5BCNM