[edit] Heh, looks like someone was inspired by that video. They went and made an iPad game just for cats: http://www.ipadgameforcats.com/ (free)
[edit-2] Oh okay, that one was released just a few days ago... but apparently something similar has existed since mid-May (at a cost of 99¢): App For Cats (which still wasafterthe Iggy viddy on YouTube)