Missing gstglvideoflip plugin
The GNOME runtime contains most OpenGL plugins for GStreamer, but the glvideoflip element is missing.
This is most likely due to a missing package in the build environment (graphene), as glvideoflip is only built with the presence of that package (https://gitlab.freedesktop.org/gstreamer/gstreamer/-/blob/4e60e91a05bb09c71b1ceadab0d1126852f0d81e/subprojects/gst-plugins-base/ext/gl/meson.build#L76)