Yes, it´s possible.
But, there are some things that you shound know:
1) Minning Bitcoin with GPU is almost dead, you should have read about other crypto coins. Specifically "scrypt" based ones.
2) Nvidia are not power efficient for mining... would be better if you just sell the nvidia and buy a amd with the same price. Unless you want to use your nvidia for gamming, video editing... dunno... just not for mining.
3) CGMiner = AMD ; CUDAminer = Nvidia ... diferentes programs. don´t no if they work well together... if it does, them you are good to go :-)
hope i had help you.
1What's up with all these people recently wanting to start mining on GPU or even CPU? It's absolutely totally pointless. – Jannes – 2013-11-13T12:14:35.347
You don't think I know that, there's no need to flame. I would like to mine because I find it enjoyable, its not all about the profit. It is also not pointless. – KDecker – 2013-11-14T02:32:44.793