Reacting to the Norman Granz item in the following exhibit, Alan Broadbent writes:
I’m sure you and your readers must be aware of this precious film, but for the record here it is. Is it from the legendary Granz vault?
Yes. Granz produced, wrote and narrated the film In 1950. He titled it Improvisation. The photographer was Gjon Mili, who had 
collaborated with Granz six years earlier on the short subject Jammin’ The Blues. The players recorded the music in advance. For the filming, they synchronized fingering and breathing to match the recorded track—some with greater success than others. The synching efforts seem to account for the amusement among the musicians. This cast of players is typical of those Granz assembled for his Jazz At The Philharmonic concerts.
Collective personnel: Charlie Parker, 
Coleman Hawkins, Hank Jones, Ray Brown, Buddy Rich, Bill Harris, Lester Young, Harry Edison, Flip Phillips, Ella Fitzgerald.
That clip, outtakes and a good deal of subsidiary material, exist on this DVD.