This position also known as Video assist operator in the film and TV Video-Playback also known as 24 Frame Playback, or Computer/Video Playback is the playing back of computer or video content to screens that appear on camera.
Vdo Man in film set in Thailand take the images generated by the film or digital cameras and display them on video monitors so the director and other crew members can see exactly what’s been shot. These images are also recorded for playback, so the action can be reviewed after each take. They are a reference through which continuity can be checked. The playback is stored to form a complete archive of the shots taken throughout the production.
Video assist in Thailand are primarily there to assist the director and script supervisor but they also work closely with first assistant directors, camera and visual effects crews. On bigger shoots, they have a video assist assistant and a video assist trainee to help.