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the TrackerKCF uses a combination of grayscale and "color names" features by default , and the latter cannot be used with a b/w image.
(from c++, you'd set the correct flags in the TrackerParams to mend that, but this is not possible from python)
it's unclear, which opencv version you're using, but a recent pr changed this behaviour, so the color-names get disabled automatically, when you initialize it with a grayscale image (you would have to update to latest master branch for both opencv and opencv_contrib, and rebuild your cv2)
