To have fun with videochat, it may be easiest to start by using your laptop to create an alternate user-ID in Gtalk and enable videochatting. Then put that ID in your phone's contact list. You should then see the videochatting option associated with this contact. Call yourself from the PC and play with the options. Tapping your picture on the phone turns the video feed from the front facing camera on or off. Tapping on the phone's larger video feed changes the appearance of the UI. There is also a button to toggle whether you want to select the main or the FFC to send to the other party.

Some tests ran fine, especially when the n9 called the computer, but I had trouble linking the n9 with a Samsung smartphone, even though both showed the video option icon as available. It took a couple of runs for things to stabilize, so keep at it. I am confident that these few kinks will be quickly resolved.