Hi,I am the author of this video.
My english is bad,I have to use Google Translate 
Today,I share this lightgun software 
Congratulations and thank you for this interesting post.
I have a few questions for you, I hope we can clarify.
First of all, because you have to use a ps3 usb / can, very dated (performance) when you could use an HD or 4k usb webcam, or other prof video source. for a much greater precision in details / brightness / resolution .... which could be ideal for a "bright spot" reception?
The cameraxy program (v1,2 ...) is being worked on for this purpose (lightgun) with hopes that it can be improved or not?
I tried a few hours ago, with the ps3 cam, and beams of light ... even laser (although perhaps harmful if pointed at lcd ...) I also tried various infrared leds of remote controls .... but in the end, the only acceptable way was to use a white LED light beam ... shot a few cm away
the other systems, even the precise laser (red), respond only partially in the lowest point of the screen ... (the closest point where the camera is positioned) compared to the mid-high points of the screen ... where the moving the mouse cursor.
The sore point, however, remains the cameraxy.exe program ...
moves the mouse cursor on the desktop ... but on many programs, both in window and in full screen, it stops working ...
FOR EXAMPLE with mame (any version) once the game is launched, the mouse works only manually but not through cameraxy !!!
and together with MAME also with other proven games.
PPjoy cannot be a solution, except with extreme and malfunctioning lags.
moreover it is not possible to install (drivers) easily ... probable old version inf.
What are the hopes of rendering compatible with the mouse, cameraxy.exe in a more optimal way?
thanks and open to any test if needed.