Robert Baggs at Fstoppers has compiled a list of ten must-see photography documentaries, noting that when he finds himself lacking in the inspiration department, watching a documentary on another photographer can help him get his creative juices flowing again.

One of the documentaries he lists is "Bill Cunningham New York", a 2010 profile of the New York Times fashion photographer who's known for his distinct style and street photography. Cunningham has received numerous awards and continues to regularly photograph in Manhattan, looking for people who express a unique sense of fashion and style. If you'd like to see the documentary and are an Amazon Prime member, you can find it for free on Prime Video.
http://www.imaging-resource.com/news/2016/05/17/learn-from-pros-photography-documentaries-provide-interesting-insights