OBS Game Capture Color & Chroma Key?

With Xsplit, you can use color key and chroma key in game capture, but i would much rather use OBS since ive used it plenty of times before when streaming and because XSplit IMO is very un user friendly. I am aware that i can do chroma key in windowed mode games, but i get a ton of lag on my stream and my game when in windowed mode with my new graphics card on windows 7. (NVIDIA GeForce GT 730 2GB). i can however do it on windows 10, but i can no longer update to windows 10 due to some dumb reason. I might at some point just restore windows 7 and reinstall everything, but i would much rather stay on windows 7 and use this in game capture. Just a suggestion. Its kinda crutial for what i do tbh, see an example below

https://www.youtube.com/watch?v=tFzwk9sEP1I
 
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