1. A computer implemented method comprising: detecting one or more objects within a sequence of frames; determining a movement of the one or more objects; determining a direction of the determined movement of the one or more objects; generating a polygon comprising the one or more moving objects; and applying a blur effect to areas of the frame that are outside of the generated polygon, which blur effect is of a given intensity at an area adjacent to a boundary of the polygon and increases in intensity in areas that are further away from the boundary of the polygon.