By now, we should have an application that displays a camera feed, listens for keyboard input, and (on command) records a screenshot or screencast. We are ready to extend the application by inserting some image-filtering code (Chapter 3, Filtering Images) between the start and end of each frame. Optionally, we are also ready to integrate other camera drivers or other application frameworks (Appendix A, Integrating with Pygame), besides the ones supported by OpenCV.