What a cute demonstration of a nice technology – acting as you have a computer mouse without a mouse:
Probably this gives us the opportunity to interact almost everywhere (in a traditional style) with a laptop (in bed, at kitchen table, etc.) without carrying around the (hardware) mouse.
One has the ability to feel the ‘click’ and so you have tactile feedback of initiating a interaction function. But what if one acts with the hand out of the camera sight? Whill there be false inputs or no one? How to inform the user of the right hand position?