Nam June Paik was one of the first video artists, and he is one of the better known.
This installation has 336 TV sets. It used to have 50 DVD players, now they use media players. 3750 ft of cable.
https://www.youtube.com/watch?v=Q_6HAMtqW3Y
This whole video art thing started in the 1960s, but video installations probably in the early 1970s.
IMHO, making a video wall out of CRT TVs is boring, flatscreens are better suited for that. CRT TVs are boxes, and should be arranged in more creative ways. I cannot find a video with an installation in the Centre Pompidou. Ah, well.