How do I play video from a PC via cable?

Your multiple posts on different issues have been noted as possible spam or trolling. 

You can't play it directly, you need to use Horizon Link to connect the Quest 2 to your PC with the USB 3 data cable, then use a VR video player on your PC, such as BigScreen or DEOVR. You'll need working controllers, however.

If you are using a cable, then you are most likely using the Meta Link desktop software, which doesn't support hand tracking, so it needs a physical controller. You could probably use an xbox controller though, the desktop software supports them.

For hand tracking only, the best way would be wifi. You can either use Virtual Desktop (supports hand tracking for control), or get a native app like Skybox. Skybox is a commercial video player that supports networked playback of files from other devices. It can even see recorded videos on my TV settop box, any shared drive on my network is viewable. The app and playback itself would be running purely locally, it just streams the file to the Quest as needed.

(I haven't tried Skybox with hand tracking, no idea how usable it is)