To use these "moving" wallpapers, most users rely on (available on Steam) or Lively Wallpaper (open source). These tools allow you to apply .mp4 or interactive web files as your background while automatically pausing them when you open a full-screen game to save system resources.
Tanjiro ejecutando una postura con efectos de agua fluida y dinámica en 4K. Spirited Away (El Viaje de Chihiro) - El Tren sobre el Mar: