Showing detail should be used within a scene and telling should be used as glue, transitions between scenes, or short info dumps of important information. Parsons just stuck her nose up and passed on by. He danced a couple of soft shoe steps and jammed the hat back down on his head, forcing his straw colored hair to shoot out in all directions, making him look like a scarecrow. Action is now tied into the description. Just enough detail makes it fresh and interesting.
Film is a very good media for story telling.
Description, action, and dialog are presented simultaneously. Unfortunately, the written word doesn't have such a wide bandwidth of data transmission. We can only simulate the highly detailed descriptions of film with metaphors, similes, and beautiful prose. We're not going to describe everything in minute detail, but we'd try to create the right atmosphere and emotional impact with carefully chosen words. What the camera focuses on in film is what the narrator should focus on in a story.