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http://5dfilmmaking.com/05/how-to-shoot-raw-video-on-your-5d2/ has the main points.
Basically you upgrade your 5Dmk2's firmware to 1.1.2, then download the Magic Lantern build from the ML site (the official build on the homepage), then download an experimental build from the forums, merge that in with the official one, and copy it to your CF card.
This thread ( http://www.magiclantern.fm/forum/index.php?topic=5655.0 ) has the best mk2 build right now. So you'd download the raw_rec module file and a.d.'s ML bff47c520033 build (both are linked in the first post) and like I said, merge those in. It seems complicated at first but it's really not a big deal once you've done it.