Video Stop playing while audio continues in any player(VLC,Quick Player) or on YouTube on any browser

Valve/Steam is software used to optimize game play to GPU. Most games today use much more sophisticated GPUs than your laptop has.

Make sure all your games are rated for the mobile graphics processor built-in to your machine. Uninstall any games that you do not use, as they may be delaying your video usage.

Reggie Answorth AppDelete is a good uninstaller for any software that doesn't come with its own uninstaller.

Simply deleting an application from the applications folder does not remove it from the background apps, whcih could be slowing down your video.