[Bug 764148] gtkglsink doesn't fail to create on incompatible hardware

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764148

--- Comment #4 from Russel Winder <russel at winder.org.uk> ---
Given the GStreamer architecture, that makes sense. (Sorry I had to be hit over
the head with this point twice before it sank in.)

That leads to the questions:

Is it possible to query the platform and GStreamer to see if the OpenGL version
the former provides and the latter requires are harmonious prior to making the
choice of whether to create a gtkglsink or a gtksink?

If a gtkglsink element has been created, is there a message on the bus prior to
instantiating the GL context?

Is it feasible to replace the gtkglsink with a gtksink and continue if the GL
context creation fails?

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