Only for one person though which isn't a great thing for TVs which generally have more than one person watching. Also the tracking is a bit of an issue, you'd have to wear a little headset to accurately track your head when they were released. Now you could maybe get away with using a camera for tracking but now you've got the privacy worries of that happening.

Yeah, that's how this system works, using eye tracking instead of a goofy game controller strapped to your head ;) https://www.cnet.com/tech/computing/sonys-5000-eye-tracking-...