This video is totally silent, totally modern, and has nothing to do with the Civil War, but it’s still very relevant: This is a start-to-finish, real-time demonstration of how to make a tintype photo, which along with ambrotyping were the main photographic processes during the 1860s.  Fascinating to watch, it makes you realize why there were no action shots taken during the war, and also makes you appreciate how many existing, perfect photos from the period exist.

Making a tintype- First-person point of view using a GoPro – YouTube.