Yeah, through bootcamp of course! So long as a game like that runs over 30fps and 1080p i have no complaints. I never expected an imac to run games at a crazy level anyway. If I wanted that, i'd have bought a proper windows computer with far better specs. But my main intention with any mac is productivity first, gaming second.
It's just nice to know I have a computer that if I did choose to play games like gta v etc that it won't die out on me in a moments notice.
If you played at 1440p at medium settings, you'd probably get around the 80fps tbh. There is a few things that you will want to turn up such a water detail to very high and everything, so you will be looking at either 1080p or 1440p for wether you want over 60fps or a little under it.