Fixed draw_bbox when pyplot is in non-interactive mode#2288
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Addresses issue #2283. As documented in Matplotlib's interactive guide, show needs to be called without blocking the thread. When run in non-interactive mode, the default behavior of
show()is to block the loop until all windows are closed.Also fixes the frames being shown with the color channels in the incorrect order (
VideoReaderreturns RGB frames,imshowexpects RGB frames, and the channels were being swapped as if the frames were BGR).This fix was tested on OS X.