The video is a really good starting place to learn what he's doing since he's playing it right there.
It sounds a lot like a open-D or open-G tuning. He's not playing normal chord positions or shapes, but what he is playing looks and sounds a lot like what I'd use for either of those open tunings, especially when he's hitting the "low-E" and "D" strings with the left hand. (I'm quoting them because the E is probably tuned down to a D giving him octaves on the two strings).
Practice hammer-ons, especially multiple fingers, and especially chord-forms with the right hand. You'll need very clear, clean, tones when you hammer-on.
This sort of sound requires fresh, new strings on your acoustic guitar. New strings are brighter and more lively.
Notice that he's got a pickup in the soundhole, and also miking the guitar. Because he's using hammer-ons, but the volume is pretty consistent, I think he's got a good studio compressor running on both feeds too, otherwise the hammer-ons would be a lot lower volume than when he strums.
It's a nice song, thanks for pointing it out.