Implementing the chroma key effect

Chroma keying is also known as chroma key compositing. It is also colloquially known as the green screen or blue screen effect due to the green or blue background that we use while creating this effect. It is a post-production technique and can also be used on still images and live videos. In the chroma key effect, we place an object or a person in the foreground and capture an image or footage. The background is usually a green- or blue-colored fabric or wall. Then, we replace the green or blue color in the captured image or footage with another video or an image. This makes the viewers feel that the person or the object in the foreground is at a different location than the studio where they were filmed. This effect is one of the most used effects in film-making and live weather forecasts in news broadcasts:

1. Let's start by importing all the needed libraries and initiating a video capture object:

   import numpy as np
   import cv2
   cap = cv2...