In 1950, a live television interview on the set of Destination Moon was captured on kinescope. The interview features George Pal, Robert A. Heinlein, and Chesley Bonestell:
The film appears to be available on YouTube — with embedding disabled.
(Hat tip to Ron Miller at io9.)
It made me think of the Soviet movie Road to the Stars. Not only was it inspiration for 2001: A Space Odyssey, but they also “borrowed” filming techniques, how to simulate zero-g for example.
From Encyclopedia Astronautica:
“Road to the Stars was one of the most amazing special effects accomplishments in film history. Pavel Klushantsev began working on the colour film in Leningrad in 1954. His aim was to explain and realistically portray the coming age of space exploration. With technical advise from Tikhonravov (who was secretly developing the Soviet Union’s first manned spacecraft at the time), Klushantsev showed tremendous ingenuity in explaining and portraying man’s conquest of space. The film was nearing completion when Sputnik 1 was launched. Klushantsev hurriedly filmed a sequence illustrating this feat, and the film was released internationally a month later.”
And yes, it is also available on YouTube: Road to the Stars (1956-1957)(restored color).