In this video Mark is playing mostly around open chords G, Em7 and D, just with a few extra embellishments which make it sound tricky.

 

Here's links to the main chords the way Mark was playing them:


Chord Name Link to Chord Diagram

D/F#

http://www.chorderator.com/designer?tuning=EADGBE&frets=2+0+0+2+3+2

G

http://www.chorderator.com/designer?tuning=EADGBE&frets=3+2+0+0+3+3

Em7

http://www.chorderator.com/designer?tuning=EADGBE&frets=0+2+2+0+3+3

D

http://www.chorderator.com/designer?tuning=EADGBE&frets=++0+7+7+5
Dsus2 http://www.chorderator.com/designer?tuning=EADGBE&frets=++0+7+5+5