First I recommend you try this before you buy the camera/tripod for recording the games.
Download the MSI afterburner2.3, I do try it on my other PC ( E6300 o/c to 3.8GHz, 4GB RAM and HD4770, win7 64bit, OCZ vertex2 120GB). I installed the win7 and COD MW2 on the SSD, to do the recording and saving the video to the other HDD. It works fine. The old version can record games play but no sound.
The afterburner can OC your GPU, control the video card fan speed, screen capture, aslo can record your voice and games play.
http/event.msi.com/vga/afterburner/download.htm
If you want to buy the camera to do it, get this point and shot one with 1080p Full HD Video and HDMI port.
http/www.amazon.com/Canon-PowerShot-Stabilized-Wide-Angle-3-2-Inch/dp/B0075SUJ4W/ref=sr_1_3?s=photo&ie=UTF8&qid=1352056932&sr=1-3&keywords=1080HD%20camera&tag=vglnk-c1001-20
and the tripod for the camera.
http/www.amazon.com/Vista-Explorer-60-Inch-Lightweight-Tripod/dp/B000V7AF8E/ref=sr_1_1?s=electronics&ie=UTF8&qid=1357098160&sr=1-1&keywords=TRIPOD
Also check out this one http
/www.newegg.com/Product/Product.aspx?Item=N82E16830184177&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=5320895&SID=skim15512X721248X8a6199aaf56601483f2561323bbf1c53