NO... A capture card is different than your video card. It would have a COAXIAL input. You have everything out. Go buy a TV CAPTURE CARD. Has a connection that looks like a tv connection.
ATI had a nice TV Wonder card, now they dont make those, but a tv card would allow you to hook up a coaxial cable or a standard video cable, although you need an adapter to hook the audio cable to the line in on yur sound card. Although you lose out on all the surround sound. Good for recording tv shows though.