Fixed uses of WebCam for OpenCV 3.x

AlexeyAB

2018-03-20 fe4f01b1d8cce9762e47aaf42b6e17a3427a144b

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#rm test_dnn_out.avi
 
./darknet detector demo ./cfg/voc.data ./cfg/yolo-voc.cfg ./yolo-voc.weights rtsp://admin:admin12345@192.168.0.228:554 -i 0 -thresh 0.24