OpenCV 3 compatiblity

[ArkadiuszRaj]

To have compile working with latest OpenCV one must change acx_opencv.m4 to:

• remove legacy and contrib libraries
• add videoio library

[cmarmo]

Let me install openCV3 and I will test.... maybe you have a pull request to propose? :)
Thanks!

[ArkadiuszRaj]

Pull request is already hanging for a while...

[cmarmo]

Hi Arkadiusz,

your version is incompatible with a double installation OpenCV2 and OpenCV3, I can't merge as is. :)
Cheers,
Chiara