As we have seen, OpenCV can capture, show, and record a stream of images from either a video file or camera, but there are some special considerations in each case. Our CaptureManager class abstracts some of the differences and provides a higher-level interface to dispatch images from the capture stream to one or more outputs—a still image file, video file, or window.
A CaptureManager object is initialized with a VideoCapture object and has enterFrame and exitFrame methods that should typically be called on every iteration of an application's main loop. Between a call to enterFrame and exitFrame, the application may (any number of times) set a channel property and get a frame property. ...
