Video processing tracking two points

I am trying to detect two points on a gray surface and then track their position throughout the video. I tried the KLT and it was not working giving me an error and the points are not being detected because it is a gray picture and the two points are dark. What method should I try?

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Image Analyst
Image Analyst 2016-5-28
Well you're not segmenting out the dark dots properly. Perhaps your threshold is wrong. For what it's worth, I attach a demo where I track a green marker in a video.

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