Not cgi at all! It was real, honest to goodness dancing by a guy named Johnny Cervin. The commercial first aired during this year's superbowl and the commercial was even available for download on the superbowl's website.
Here is an article about it: http://www.usatoday.com/money/advert...vis-dancer.htm
Well, actually the shots are computer trickery in some respect (and obviously so based on the position of his upper body and his lower body). The article linked above mentioned it:
His legs might be able to move in funky motions- but not which standing erect and walking the way it is displayed in the commercial.