You just need a basic capture card to do so. I did it all the time with my external USB card(which I'm trying to sell if your intersted)
The only problem with using regular camera's is that they tend to cut off after 10 minutes or so if they aren't recording or something. Leave yours on for a while and you'll see what I mean. I beleive it will even if it's connected to the wall, the power save mode tends to kick in...