[Bug 747606] v4l2: adding cropping and compose functionality

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747606

--- Comment #2 from patcherwork at gmail.com ---
To use the cropping and composition, a structure is expected, for example:

v4l2src crop=crop,left=100,flag=g ! videoconvert ! ximagesink

All fields ommitted are filled with the default values. The structure names are
expected to be crop for the cropping structure and compose for the composition
structure. The flag paramter can also be set. It expects a string with l for
the V4L2_SEL_FLAG_LE flag, g for the V4L2_SEL_FLAG_GE flag and kc for the
V4L2_SEL_FLAG_KEEP_CONFIG flag

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