1. A system comprising: a display device that displays video content to a person wherein the video content comprises a plurality of frames; a media device that provides the video content to the display device; a pointing device that the person uses to choose a screen coordinate on the display device; frame specification data that identifies the video content and which of the frames was displayed on the display device when the person chose the screen coordinate; a query comprising the screen coordinate and the frame specification data; and an element identifier provided by an annotation database in response to receiving the query wherein the annotation service comprises a human worker who determines the element identifier based upon the query.