CamColorExtruder is a project realised with the openFrameworks framework. Using your webcam it identifies areas of certain color and extrudes them as 3D-Boxes. You can switch colors by pressing 'r', 'g', 'b'. Pressing 'x' enables custom color picking: drag/click with your mouse at color you'd like to extrude.
Clone the repo into your oF app directory and run make.