I am aware of KinesicMouse: Download KinesicMouse and try the hands free mouse for free
It would be good to check with the software developer department to see if there are other programs for mouse control using RealSense.
Yes, there is an app that does exactly what you need. It is called "USigner".
"Using Intel RealSense innovative technology and a stereovision web-camera, the USigner app reads the movements of your hands and allows you to control the cursor and simulate the pressing of “mouse” buttons by hand gestures."