adjust matchTemplate in performance sample, as current version is too slow when template size isn't small

Legend for new column is:
* FASTER - strong speedup
* faster - spedup is detected but it is unreliable
* <empty> - no change in speed
* slower - slowdown is detected but it is unreliable
* SLOWER - strong slowdown

OpenCV version incremented;
New CvCameraViewListener interface description added.