|Detail of Boulevard du Temple showing a man|
You can view the entire picture at How to Be a Retronaut which has an applet that allows you to pan and zoom the photo. Some viewers say you can see other people in the picture. There are some artifacts in the film that might be people, but none are so clear as the man getting his shoes shined.
Because of the empty street with only the single blurry image of a man, to me it is a slightly eerie picture. His solitary presence reminds me of one of those old Twilight Zone episodes where an antisocial person ends up cursed and living in an empty world.
Another early picture, this one from 1848, shows two men standing next to the Ohio River in Cincinnati. You can view that picture and read about it at Very early photographic images of humans discovered.