It’s LC-39A, pad camera E-8.
Soon as I saw the title card I could stop playing, I’ve watched and rewatched this footage so much i can play it back in my mind. If you haven’t seen it and you love rockets, this is a must watch, the F-1 engine in all its glory. The details are clear enough you can clearly see the turbopump exhaust stream flow interacting with the rest of the combustion chamber “rocket exhaust”.