I think.....after watching the vid a few times, stop-action shows he was drifting towards the left, got the left rear out of the groove and likely yanked it too hard/too fast back to the right, overcorrecting and then hitting the right side wall. Watch the rear tires at about say the 800' foot mark start to drift over to the matt-colored asphalt (out of the groove) and by say the 1200' mark both left tires are clearly out of the shiny 'groove' part of the track one can see at the 1320' and beyond. Lucky is he and his car!
Btw, the tires appear to be street radials and not drag slicks or look-alike M/T type slicks. Have seen too many high powered streeters spin or 180 deg. loop their cars in a similar fashion (usually near the start line though!) due to getting out of the groove (lined up badly), having water drip onto the track due to a poorly executed water burnout, etc. Never did like seeing a fast drag car on street radials, at the track at least, since the often time the smooth surfaces, unlike true street pavement, can cause havoc.