Sounds like he's playing in Drop D, or maybe Open D.
I can only listen to so many breakdowns and "spoken word" vocals before I wanna puke.

I find Jennette McCurdy attractive, but Elizabeth Gillies and Debby Ryan much more so.

That's enough, Djent people. We get it.
i think it's just drop D. cause at 4:10-4:15, it looks like he's playing a D Major chord.
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I think it might be some kind of open Eb, I'm really not sure but I'm pretty sure it's not D, I have a guitar in D near me and I think it's a bit lower than that video.
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