Optimal params for optical flow tracking. Some small box fixes.

AlexeyAB

2018-02-08 be90b8e8cb6bbf3951a5e185aa43ccfdd4a03f4d

 build/darknet/x64/yolo-voc.cfg

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