To disable gecko-camera, zypper rm gecko-camera-droid-plugin
then journalctl -f is
GMP-DROID Info: InitDecode: Codec metadata prepared: video/avc width=832 height=468 fps=0 extra=45
GMP-DROID Info: Codec created for video/avc
GMP-DROID Info: Received size changed 832 x 480
GMP-DROID Info: ConfigureOutput: Configuring converter for stride:832 slice-height: 480 top: 0 left:0 width: 832 height: 468 format: 21
library "libI420colorconvert.so" not found
GMP-DROID Info: Colour converter class: ConvertYUV420SemiPlanar
GMP-DROID Info: InitDecode: Codec metadata prepared: video/avc width=832 height=468 fps=0 extra=45
GMP-DROID Info: Codec created for video/avc
GMP-DROID Info: Received size changed 832 x 480
GMP-DROID Info: ConfigureOutput: Configuring converter for stride:832 slice-height: 480 top: 0 left:0 width: 832 height: 468 format: 21
library "libI420colorconvert.so" not found
GMP-DROID Info: Colour converter class: ConvertYUV420SemiPlanar