There exists no shortage of naysayers regarding this particular tech (especially on the video’s YouTube page). The notion of reading electrical impulses transmitted by eye movement for gesture control has long been a future tech darling, dating back to (at least) the era of Firefox (the Clint Eastwood film, not the Mozilla browser).
Clearly, there are abundant opportunities to bring a mature version of this technology to market in interesting ways. I’ll spare you the tedium of enumerating them.
What came to mind immediately, though, was a seemingly lower-tech problem (for which eyeball gestures might well be overkill), namely: How can we apply online following behavior to offline entities?