Going Mad: The Battle of Fury Road (2017)
https://www.youtube.com/watch?v=_9klHcXRdSs - from the Warner Bros. Entertainment YouTube channel (41 mins.)
(Actual documentary starts after an introduction by Sean O’Connell of Cinemablend, 2 mins. and 12 seconds in.)

The blurb (from Letterboxd):
“For 20 years director George Miller fought to unleash the ultimate Mad Max movie- Mad Max: Fury Road. Witness George’s journey from the dream of a female warrior to the harsh plains of the Namibian desert to statues of gold in Hollywood, California.”