Compiling this is somewhat tricky. Since Aakash has a Mac laptop, I'm leaving this in xcode project form. Please open the Xcode project to compile it. All the libraries *should* be linked from /usr/local/lib or /usr/local/include, but you might need to change that in the header search paths. If you don't have OpenCV or GSL, I would recommend installing them with homebrew.

You must also edit the first two lines of main.cpp to change the path of the video file and face classifier file to the correct locations. (because xcode puts the executable in a weird folder)

Once compiled, it will just run and start playing the video with the Vis overlayed on it.