I can't hear it very well, but it to me seems that he only plays the root of the chord, and sometimes powerchords. So mostly just like a bass part with some percussion/slaps ontop. And he's playing the same thing over and over again.

I don't know how to post "codes", but this is what I hear (only the A and E string)

A |-----------7----------|
E |--7-x-7-x--x-5-6-x|

Those tones are repeating all over, and he's perhaps also playing them as powerchords sometimes, except the last two that always are single notes. Since it starts and resolves on the B tone I assume that it is in the key of B minor, and the A that is in the last part just are used ass a passing tone to the A# before it repeats itself.

Hope this helped!