Depending on how fast VideoLAN (VLC media player) can capture ..
How to capture/record desktop video using VLC media player
http://www.instructables.com/id/How-to-capturerecord-desktop-video-using-VLC-medi/
.. (that demonstration is at a "blazing" 10fps), you may require more dedicated software.
Videogame players tend to use the known and staunch FRAPS http://www.fraps.com/ to grab fast action gaming at high resolution/frame-rates, for game without built-in recording. However, there are similar programs jockeying for that dominant position. Like any software solution, how well it works will depend on the power of your system to keep up.
Always download from the original site for "clean" copies, and otherwise check user reviews to confirm their authors are not including unwanted ad-ware / spy-ware.