Added preview boxes for SO/DLL usage

AlexeyAB

2018-01-24 cc6ab9b3ccf48322b97f7fe096381d5594d198f7

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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