If you're connected with the HDMI cable, I don't know.  They might have a capture card for that.

You won't need a specific one if you have AV inputs on it.
You will need to get some AV splitters (turns one wire into two).  I got mine at Radio Shack.  (sold individually for about $3 each, 3 needed)
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I got the cheapest USB capture card from ebay.  It was around $7 before shipping from China. 
I also have a USB extension cable since the cable on the capture card is short. 
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Wires and USB tuner card = (<$30)

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Let me know if you have any other questions.