new VideoConnectionObserverInterface()
Interface description for the observers of the VideoConnection singleton.
If an objects wants to be informed for a specific event (when a frame is received for example) they can register as an observer.
Registering an object as an observer for a VideoConnection instance is simple as calling videoConnection.addObserver(object).
Then, if the observer defines any of the methods described below, they will be called whenever it is appropriate.
All methods are optional. Just implement those you need in your class and add it as observer.