[methou]

eyetracking is already used by the advertisers in research for many many years, e.g: https://www.tobii.com/

[turnsout]

Yes, in research. But once they can see what real-world users are looking at in context, in realtime, it's a different ballgame.

[ta123456789]

This already happening in many places. And does not seem to be he intended application in the OP