The mouse pointer is a key component in a graphical user interface (GUI). Without it, you can't really think about interacting with the GUI. So, let's dig into the built-in functions of mouse and trackbar in OpenCV. We will demonstrate how to use the mouse to annotate the image and how to use the track bar to control the size of the image
We will use the image below to demonstrate the use of the mouse pointer and trackbar functionality in OpenCV.
