yes, but if your cpu is powerful.
I really don't think that the CPU does any type of recording. It is your hard drive or your dvd/cd player that does the recording. Your GPU's are sending the signal to the monitor but can't receive a signal from an external source.
Like said above you would need a tv tuner card to record to your dvd/cd or your hard drive. I suggest to check other forums on here or other sites and get a second opinion.
Because to the best of my knowledge you can not do what it is you are trying to do. I do wish you the best on this and I would want to know for sure. And if you do find out it is possible could you come back and let me know?