There are various nodes one can use inside Nuke to extract the green screen. Whilst the Image-Based Keyer (IBK) nodes were as less complicated and more straightforward in their application, the Keylight node required more attention and experimentation with the screen colour and screen matte attributes.
After attempting the shot during the first time, the constant problem that occurred was in how bright the red top was and how much contrast it created with the background. After finding a plate which suited my vision for the shot, I focused on using an imported node, called ColorPickerID, which allowed me to adjust a specific colour, without affecting others as much. It took me sometime to figure out of where in the script to place my adjustments, but it worked out in the end.
Looking at the footage, it still appears like it doesn’t suit the shot well enough, as the lighting of when it was shot differs to the lighting from the background.