Finally I bought it!
It works great with my laptop’s webcam and shows 29fps even in a darkened room! What’s more, it allows the vJoy sliders to be controlled simultaneously with the TrackIR, defining any segment of any of the 6 tracking axes as an “overlay” for the vJoy, which is very interesting as it gives me the ability to dynamically change the FOV when I reach the maximum allowed travel distance along Z . I can still move my head forward / backward inside the cockpit, and when I get to “full stop”, it starts to zoom in! A very cool feature when working with an MFD and when landing!