Install banshee-extension-coverwallpaper by entering the following commands in the terminal:
sudo apt update sudo apt install banshee-extension-coverwallpaper
Cover wallpaper extension for Banshee
CoverWallpaper is an extension for Banshee which automatically sets the desktop wallpaper to the cover art of the currently playing media. . Banshee is a media management and playback application for the GNOME desktop.