Fixed demo for video files: is used do_nms_sort() instead of do_nms_obj().

AlexeyAB

2018-05-21 46028c6621f1a75874054db23dfa103a7759a483

 build/darknet/x64/yolo-voc.cfg

@@ -256,3 +256,4 @@
absolute=1
thresh = .6
random=1