Philly South Street Bridge
When capturing a day|night backing from the south street bridge, one will always be looking over the river walk, a popular public park, and major highway Interstate 76 (on the left). Even in the middle of the night, but especially during the day, it would be impossible to avoid seeing people walking or cars driving by.
By capturing both stills and video of the scene, a day|night backing could be printed using the images to the right, and later it would possible to drop movement in the view in VFX with matching parallax, scale and point of view.
See below for example showing video overplayed into the backing images.
.