yea, if you want to play that song in open chords, youd need a capo. but it sounds just as similar (in that song) as if you just barred the chords. plus, he does a little 4th-to-5th thing with his finger when he plays the chord to get that kind of rhythym, like this: (assuming its in open position)

---------------------------
---------0-0-----------------
---------0-0---------------
--2------2-2---------------
--0-h-2--2-2-------------------
--0------0-0------------------