Apart from the utopian idea of cross-European connections between people, I wonder how difficult it would be to achieve such a realtime full-size videoconferenc

Apart from the utopian idea of cross-European connections between people, I wonder how difficult it would be to achieve such a realtime full-size videoconferencing system. Considering it should allow public communication as well as private talks (like in the real life as drew in the video), I thought it would require some sort of distributed mic/camera/speakers over the wall surface. And you would still need to sort out the bandwith/latency issues.