1. A method comprising: receiving a captured and stored sequence of images depicting a physical scene; analyzing at least one image of the sequence of images; detecting a visual command appearing in the at least one image, the visual command provided by a person depicted in the at least one image, wherein the visual command instructs a change in visual appearance of the person in the at least one image; and obscuring the visual appearance of the person in accordance with the visual command, wherein the visual appearance is obscured in at least one or more images following the at least one image in the sequence, and wherein the obscuring includes changing the visual appearance of the person to be partially transparent in the at least one image, including placing a previously-captured or estimated background image portion of the physical scene over a portion in the at least one image corresponding to the person.