[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #23 from kevin <kevinbing.song at gmail.com> ---
I agree with you, dequeue buffer or dequeue event can be decided by return of
polling. So dequeue event can keep alone with dequeue buffer.

Do need wait event before g_fmt () of CAPTURE? or driver should wait and ensure
get right video format?

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