Using Green Screen is a big help nowadays for film making. Specially at this era of pandemic, people are prohibited to go outside. 

Green Screen is the easiest method of filming. You don't need to go to the actual place of shooting. You just need to shoot or film the scene/video by using a green background on it. You can use anything green like papers, clothes etc.

By using Green Screen method, you can simply edit the video background easily and it looks as it is of the original video.