You can try ubuntu with legacy kernel 4.4 or 4.9 which uses mali proprietary driver.
That is what coreelec uses to achieve vpu support for video playback.
Beelink GTR7 (7840HS) - Manjaro Linux
Beelink SER5 (5600U) - Manjaro Linux
Beelink GT1 Ultimate (S912) - Libre Elec TV
Beelink GT King Pro (S922X-H) - Manjaro ARM Linux
Beelink GS King X (S922X-H) -