What is the best program to capture video of gameplay

Just figured I'd chime in here and mention that if you have a Windows 10 computer, pressing WinKey + G in a game will open up the "game bar."  From there you can record footage (with or without mic) and broadcast a stream to Mixer.  

I tried the windows 10 thing, but it I couldn't get it to work correctly. Didn't seem to want to record games in fullscreen & the overlay / key shortcuts kept messing things up somehow. I forget how now as it was ages back when I tried it, I just remember having problems with it is all. AMD ReLive causes issues sometimes too, so I disable that unless I am wanting to record something.

By experience, I use for my video record , "loilo game recorder". it is 100% free.

http://loilo.tv/fr/product/game_recorder

I use "Action!". It's made especially for games and records Visionaire Projects without problems in high quality:

https://mirillis.com/de/products/action.html

theoretically you can use your graphics card software (nvidia or radeon) like AFRLme mentioned. No additional software needed.