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Wait you are forgetting the most essential part of the solution. Once you have found the coordinates of the eyes, the iris inside can only move in a small region. Then you will need a calibration between those positions and the image positions, like what is being done with eyetracker camera's.
Take a look here: http://www.tobiipro.com/learn-and-support/learn/how-do-tobii-eye-trackers-work/what-happens-during-the-eye-tracker-calibration/
