OpenCV Video Frame Acquisition and Difference Calculation

This function captures video frames from a specified URL using OpenCV's VideoCapture class. It then converts each frame to grayscale and calculates the absolute difference between the current frame and the previous frame. The difference image is thresholded to create a binary image, which is then passed to a function called 'background_separation' for further processing.

The function also includes error checking to ensure that the video capture was successful. It returns a boolean value indicating whether or not the function executed successfully.