If you still want then connect your S-Video cable(assuming you have one) from your s-video Out of the DVD player to the S-video In of your Video card. Use the capture software(whatever you use, if NOT read the guides and other posts in this forum) and select the S-video as the source, then capture.
Hope this helps.
PS. The audio cable still needs to be connected seperately as S-Video is just that it is only video information, Nothing else. Audio from the O/P of your player to the I/p of your sound card and select the I/p in the capture software as Line-in of your sound card.