[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #21 from kevin <kevinbing.song at gmail.com> ---
How many threads will be used for CAPTURE port? Below process will block:

1. get recycled video buffer from video decoder base pool.
2. dequeue video buffer from V4L2 driver.
3. dequeue event from V4L2 driver.

Do those process need separate thread to avoid any dependence?

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