Yes, you need a matrix switcher and a Myro:Bridge to be able to use the system to switch the video source with the audio source. Just make sure you get a matrix switcher that has enough outputs as displays in the system.
For example, if you only ever will need 3 sources (STB, Bluray, AppleTV) and have 6 zones with displays, you'll need a 4x8 Matrix leaving 1 open source and 2 open outputs for future use.