Photographs are protected not because of the artistic choices per-se (since there are artistic choices e.g. of a model posing as well) but because it is in a fixed form.
A live performance is not copyrightable, but a video recording of a live performance is. Even if there was no significant artistic choice in the setup: for example, if you setup a camera on a tripod so that the entire stage is in view and record it, you've got something copyrightable.