How to set a video as Desktop Background

Open VLC Media Player. If you don't have it, download it from Here.

Then Go to Tools > Preference Or press CTRL + P and Select Video from left panel

Then Choose DirectX video output from output dropdown list as shown in below image.

Save the changes and restart VLC Media Player.

Play any video you would like to set as your desktop wallpaper.

Then click on Video and select DirectX Wallpaper from the dropdown list as show in below image.

Now Minimize vlc player and you will see your video running on your desktop as wallpaper.

If you want your default wallpaper back then uncheck DirectX Wallpaper from video dropdown list.

Have Fun..