WiFinger: Leveraging commodity WiFi for finger gesture recognition (2016) [pdf]

I think the paper is just a research project. Considering that you need a wifi on, it would not work very well on the go.

But I am pretty sure there are devices on the market just not for the use case presented here.

There are a few papers that look at the applications of what you can do with radio waves as a way to detect movements.

It already is in the market, just that it is not usually sold as a standalone product like Leap Motion. Through wall imaging using WiFi imaging is old news. Also, for gesture detection specifically, radar chips are often preferred over hacking WiFi firmware/additional signal processing.

I often see awesome papers but don’t see any way to replicate it short of coding the thing from scratch (if it actually worked). I think many of these are concepts that work in very controlled circumstances where the inference setup is probably well calibrated for the setting. I’d venture getting a more general purpose library or tool would be far more work.

There's been a few studies on this. Some for positioning, others for slightly less comfortable things like this [0].

[0] http://people.csail.mit.edu/fadel/wivi/