Checkout one of these:
Wirecast – http://www.telestream.net/wire-cast/overview.htm
VIDBlaster – http://vidblaster.com/products/home.html
I have loaded up VIDBlaster’s fully functional trial version (they put their logo on the screen until you purchase). This product is pretty good right out of the box I was up and running with a 7D and XF100 as my video feeds in a matter of minutes.
Both products let you do what you want to do.
