Fix openCV 3.4.1 highgui

Yu Hao

2018-05-31 6c675a09278aeb7f579ff9ee7c20e990119be8ff

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#rm test_dnn_out.avi
 
./darknet detector demo ./cfg/coco.data ./cfg/yolov3.cfg ./yolov3.weightss rtsp://admin:admin12345@192.168.0.228:554 -i 0 -thresh 0.25