This paper describes the process of working with green screen and the chromakey technique of green screen itself. The work is divided into two parts, the first is a theoretical part in which the goal is to explain in detail only the green screen, how the visual effect developed through history using the green screen (blue screen, black background), films that were from significance when using green screen, setting the scene for working with green screen; this includes lighting setup and how to use the camera; how a digital image is created and analyzed. The chromakey technique and the procedure of the chromakey technique with work on film tape emulsion are described. The second part of the work is the practical part, which describes the topic and postproduction of the video, which was made as an example of the green screen chromakey technique. First, the topic of the video was mentioned, which is a sketch inspired by the "WandaVision" series. Then the equipment used in the making of the video is listed. After that, post-production, i.e. video editing in DaVinci Resolve software, is described in detail. The goal of this paper is to bring closer the practicality of visual effects in the production of films, series, and to show how important they are for the further creative development of production projects.