Once you are on a current Beta or Dev Insider build, you'll need to use the ViVeTool, a free command-line utility that enables hidden Windows features, to turn on animated wallpaper. First, download ...
There have been plenty of third-party options for video wallpapers going back even further, and you can still implement the feature right now if you want to using tools like Wallpaper Engine.
Microsoft has started testing the ability to use video wallpapers on Windows 11. The feature has been spotted in the latest ...