[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

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

Tim-Philipp Müller <t.i.m at zen.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |t.i.m at zen.co.uk
           Severity|normal                      |enhancement

--- Comment #1 from kevin <kevinbing.song at gmail.com> ---
Two main points:

1. Activate capture object until got SOURCE_CHANGE event.
2. Check event if got zero sized video buffer. Stop capture object if got
SOURCE_CHANGE event, and activate it again after got changed video resolution.

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