Uploaded here upon my friends' requests. A simple program that captures a laser pointer via camera and draws lines in the output of a video projector.
Made for Raspberry Pi, but it probably can be adapter for other Linux distros and systems. However, we had to use LXDE due to something about the asynchronicity in the frame buffer.
I can't add compile/run instructions because I don't have them, and I don't have neither the Pi nor a video projector nor a webcam, so I can't test it.
The comments are Doxygen style, but I didn't include the script to compile them because they use GPL and I MIT. Uses OpenCV, so all copyrights belong to their respective owners.