I forget the models at the moment... We set up a Marantz AVR with the video select several months ago and it has worked as expected. On the same project the same feature was promised with the Pre/Pro, which does not have this feature.
Plan B, take Zone 2 HDMI out into another input on the display. For watch/listen call audio from the main zone, and your video from Zone 2. This also has worked as expected for several months.