This is the intro to the cover of the Bee Gees' To love somebody by Ray Lamontagne

I really like the way he plays with the chords in the intro.

I believe the Chords are G, F, C, G.

I tried playing around with them and try to replicate the hammer-ons and whatnot but can never have it to sound like Ray's.

I know some people can figure those things out by ear and I'm including a video so hopefully..

I'm well aware this is probably fairly easy but I'm having a hard time anyways being an intermediate/beginner player

Thanks in advance !

Here's the version.
wrong section i believe?

looks like he's just hammering the chord itself
Taylor 314CE
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2 Fender MIA Strats--SRV & JM
Alvarez w/ Modulus Neck and EMG DG-20s
Marshall JCM 2000 DSL 50 w/ 1960a cab
Breedlove AC250/SM12
Gold Tone Weissenborn
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ALOT of pedals
I think the chords are G Amin C G F G D C G and there is a little Bass run up to the Amin and a little bass run from the G down to the F however that was the way Bee Gee's played it. Its a good song
we must of played it a few hundred times. Cheers