That is from the 2007 H.O.R.S.E and that clip contains quite a lot of razz.
Also you can watch the event from the starts - the first episode is in the related videos. There is plenty of razz throughout as well as all the other H.O.R.S.E games. A very good watch in my opinion.
Razz is basically a worst hand game, like the opposite of stud and alot like 2-7 lowball but you can still use str8s as low hands and A to 5 is the nutz.
I'm pretty sure the above video is the only time the WSOP have broadcast a dedicated Razz tournament - apparently the ratings were pretty bad and you can understand why when even the players in the video are bitching about what a horrible game it is...