You can read the GameWorks SDK EULA : https://developer.nvidia/gameworks-sdk-eula. Note that you need to register, if you aren’t already. to follow the link properly you need to be logged in.
Reading over it, the basics seems to be you can use it for commercial use, but you need to inform Nvidia about it, and they have the right to use images/video and what-not for showcase/marketing purposes on their end. That’s fine by me, as that’s free advertising, haha… If Nvidia were to use something you made, that’s always a good sign 