This app is called Live Wallpaper and is produced by Giantapp. The client is open source, easy to use, and allows you to set videos as wallpapers easily. Local features are free to use, and a wallpaper community (with a low-cost Pro) will enable you to upload your own wallpapers. If you like it, please consider supporting the community.

Official website:

https://livewallpaper.giantapp.cn/

Open source address:

https://github.com/DaZiYuan/livewallpaper