1. A surgical visualization system comprising: a retractor configured to provide access to a surgical site; a plurality of cameras configured to acquire video images of the surgical site, at least one of the plurality of cameras being disposed on the retractor and configured to acquire video images within an opening to which the retractor provides access; and an image processing system in communication with the plurality of cameras, the image processing system comprising at least one physical processor, wherein the image processing system is configured to: receive the video images acquired by the plurality of cameras; receive input from a user indicating a selection of at least two of the plurality of cameras, said selection being less than all of said cameras in said plurality of cameras; provide output video images based on the video images acquired by the selected cameras, the output video images being provided for simultaneous viewing; and resize or arrange the simultaneously viewable output video images from the selected cameras to present them on a display according to received input.