[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752962

--- Comment #18 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
When you poll, you get flags as result, can be POLLIN (you can queue buffer,
applicable to OUTPUT), POLLOUT (you can dequeue buffer, applicable to CAPTURE)
and finally POLLPRI (you can dequeue event, for both). GstPoll API need to be
enhanced so we know the the distinction. I would add a method (unix specific)
where we actually pass the flags.

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