I could be wrong, but most most video card ports on the back are for output only. If you want to record data off of your screen, you could either record the data on your video camera and then get a dvd of it to put into your disc drive OR you could get an adapter that would allow your video camera into a usb port on your computer. (not on the video card) Sorry that I can't be more helpful, but since I don't know what type of camera you're using, I can't be more specific. Best of luck to you!
Also, If your trying to record stuff from your pc, there are programs that can do this for you. (such as FRAPS, etc.) Unfortunately, if you are trying to record game video these programs generally result in a large performance hit.