‘Star Wars A Conversation With The Masters - ESB 30 Years Later’:-
https://www.youtube.com/watch?v=a6xcSCotvxw&l - at the mranderson00001 youtube channel. (a 2011 release. 26 mins)
About:-
“George Lucas, Irvin Kershner, Lawrence Kasdan and John Williams look back at The Empire Strikes Back 30 years later.”