1.- I can add a secondary display and duplicate screen, but the talent will see the Nuendo project window that is distracting.
2.- I can move the video window to the secondary display, but I cannot see the video.
3.- I can add a third display with a splitter. A lot of displays… 
With Premiere I can send the video to the secondary display in full screen while I see it in the project display. I would like to have the same way in Nuendo.