1. A computer-implemented method of processing a video frame that is included in a media clip for a media-editing application, the method comprising: identifying a set of respective locations of a set of faces in the video frame; generating a set of geometric shapes enclosing the respective locations of the set of faces; and applying a set of image processing operations to respective areas of the video frame isolated by the set of geometric shapes, wherein applying an image processing operation results in modifying pixel values of the video frame.