[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #17 from kevin <kevinbing.song at gmail.com> ---
poll should based on buffer pool as OUTPUT and CAPTURE need different poll when
dequeue buffer.
For dequeue event, do need poll? if so, should add one poll in v4l2object?

How driver know unblock OUTPUT and CAPTURE poll? poll only depend on fd.

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