The takeoff pattern at Burbank Airport calls for a rather steep climb but nothing like in the video.Isn't that basically what they do for noise abatement departures? I think he was well within his safety envelope, and the long glass it was filmed through compressed the motion a bit as well. But yeah, it's always impressive to see one of the big birds climb like that.
A multi-view video of the takeoff. Watching from the inside, I was kinda surprised on how bumpy it was.
https://www.youtube.com/user/Boeing/ChooseYourView
Wow! That from-the-air shot of the takeoff is incredible.