So game launcher has the ability to screen record. What I did was go into game launcher and at the top right hand side there are 3 dots, click on it and you will see some options one including add app. Add the app that you want to have this feature, I did it with my WhatsApp because it's d only thing I need it for. I'm not sure if it works for every app tho, but try it.
@Samsung_uuGMi49 the best option for screen record is to install the Samsung App Goodlock and once its installed it will give you a list of addons install them all great customization options but the one for screen record is nice shot once installed toggle it on and take a screenshot like normal a camera with popup tap it and your recording