Remove light reflection from eyes
I solved my problem using 1) motion tracking and 2) a good picture of an eye.


With adobe after effects i managed to track the motion of the problematic iris. The result was a very precise motion path of the iris for the whole video. Great.
Then i used a good picture of brown eyes (google images) from which i cropped a circular selection which had "some" iris and the pupil. I made that circular selection a little transparent around the edges and finally had this result:





Using that image (2) on the motion path (1), the result was excellent. I had to play a bit with the colors to make the new iris blend with the original iris which "embraced" the new one.


(Fortunately, person wasn't blinking.)

p.s. More answers are welcome!