Also look at leap motion. https://www.ultraleap.com/product/leap-motion-controller/ https://www.ultraleap.com/product/leap-motion-controller/ (tip: mouser has

Also look at leap motion. https://www.ultraleap.com/product/leap-motion-controller/ https://www.ultraleap.com/product/leap-motion-controller/ (tip: mouser has them in stock and usually the best price) with midipaw http://www.midipaw.com/ http://www.midipaw.com/ (free) Latency is very low which is very important for this use case. Look on YouTube for demos.