Minimalistic C++ wrapper around V4L2

Build the demo

You need the V4L2 development package. On Debian/Ubuntu:

$ sudo apt install libv4l2-dev

Then:

$ g++ -std=c++11 grab.cpp webcam.cpp -ograb -lv4l2

Calling ./grab acquires one image from /dev/video0 and saves it as frame.ppm.