I have spent the past week or so watching old LDS videos at this YouTube Channel. The breadth of what they have is impressive. Usually people like to focus on the story-based films that the Church and BYU have produced, but there have also been many historical videos produced. The YouTube Channel has a playlist devoted entirely to these documentaries, interviews, and other videos of historical interest. I find them to be a fascinating glimpse into the past of Mormonism.
They also make me more than a little sad. When watching these films you get a real sense of the grandeur of the mid-century Church.
Here's an example. The following video is called "For the Strength of the Hills" and