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Well, i didn't motion track this. I made a layer mask with a pink fill set to HUE. Since
HUE only affects color and the eyes here are black and white, as is most of the surrounding area, HUE works perfectly to change the color of the subject. Also since most of the surrounding area was B&W I didn't have to be precise with my mask because HUE wouldn't have affected anything anyway. Then just keyframing the mask to follow the motion.
As for motion tracking balls of light: When you motion track you need to always pick a target with good contrast or a sharp edge. The corners of the eyes would work perfectly here- where the white, black, and pink meet.
Motion tracking balls of light (having not seen your specific scenario) can be hard if it is a fuzzy ball if light like #1. Number 2 in this pic would be easy but you hardly ever get a light that looks like that.
Remember that motion tracking is just a tool to save time. In some rare cases where there is not enough contrast anywhere you have to motion track and watch it while it calculates.... as soon as you see it miss the target, stop it and readjust your tracking point and tweek the settings. And in some rare cases when you cant track it at all you might have to manually keyframe your tracking in frame by frame --- which means that your eyes and brain become the motion tracker. I have had to do this too and it is very time consuming and tedious. In most cases you can get good results using a combination of the two.
hope that helps.