v4l2: adding cropping and compose functionality
Submitted by Dimitrios Katsaros
Link to original bug (#747606)
Description
This patch adds cropping and composition to the v4l2src. The reason for limiting the patch to the source is the lack of a v4l2 output device to test on. The device available also only supports cropping, so composition also requires additional testing
This patch has been developed with the current master branch, commit id: 8cfebfec