gst-gl-window-set-resize-callback on glimagesink on raspberry pi + python ?

[Stuart Axon]

https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-libs/html/GstGLWindow.html#gst-gl-window-set-resize-callback 
Hi all,   Is gst-gl-window-set-resize-callback available in python, particularly on raspberry pi ?I couldn't work out how to get it working.
If not, is there another way to get a videos dimensions ?
filesrcdecodebinglimagesink

S++
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