Issue with page "Bindings for Qt": qmlglsink has been moved to gst-plugins-good
Page https://gstreamer.freedesktop.org/bindings/qt.html says "For integration with the Qt toolkit there is the qmlglsink element in gst-plugins-bad (soon to be moved to gst-plugins-base or -good) which is a video sink that renders to a QQuickItem in a QML application."
But it appears to have already been moved to https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/tree/master/ext/qt