Invisible mouse

What happens if a computer mouse is smeared with invisible ink, like in the cartoon about Tom and Jerry?

But seriously, the device itself is an optical system consisting of a laser and an infrared camera. In the role of the manipulator is a hand that performs all the usual movements, as if there really is a mouse in it.

Usability can probably be judged after a wider distribution of the device, namely when you can touch it, so to speak, with your own hand. What undoubtedly - it opens up vast spaces for implementation in all sorts of mobile devices.
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How it works - I suggest to look at the video.