Are you an admin? READ THIS:

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Cant have shadowplay (got Intel)
And I had a Fraps, but heard it crashed garrys mod?

I'm not too sure myself about fraps, personally OBS works better for me. I would highly suggest checking it out or even just having a look on google as it helps a lot if you want to get a clear video of rule breakers.

If you want a link just to have a look at OBS : https://obsproject.com/

From what i know, its completely free, and i know it is SUPER easy to setup, but if you have any problems, like i said before, PM me

Thank you, ill check it out