From FBWalshyFTW:

This is a Halo 3 trick jumping video from Resix, edited by himself, entitled "Closure." I wasn't the biggest fan of the soundtrack, but a lot of the jumps are insane, featuring several very creative and surprising jumping mechanisms. And yeah, the editing is trick jumping video editing, but there's actually some syncing here and there. Enjoy!

Closure - A Halo 3 Campaign Trick Jumping Montage