Added to the Wayland Protocols repository back in May of 2025 was the ext-background-effect-v1 protocol for background blur that had been under discussion since early 2024. The initial focus is on being able to apply a blur effect on a window's background or otherwise a specified screen region. GNOME 51 has now merged support for ext-background-effect-v1 with the latest Mutter code...
Source: Phoronix — read the full report at the original publisher.