This script provides writing on the screen using a tool with blue color
Python Programming Language
Opencv library Numpy
Download python 3.8.5 and add to the path. Download opencv and numpy libraries(you can use this tutorial ) There will be two screens one of them is a white board and other one is your camera. Then find a blue colored object and you can write on your the screen by moving it. You can also clear what you draw. I will add the video soon