Implement Video File Loading

[Blindspot22]

Description:

• Add functionality to load and process video from a file instead of live camera input.
• This will allow users to run the module on pre-recorded videos for testing or analysis.

Implementation Steps:

• Modify the existing video capture code to support loading video files using VideoCapture::from_file.
• Implement a mechanism to check if the input source is a camera or a video file, and load the appropriate source accordingly.
• Ensure the module can handle different video file formats (e.g., MP4, AVI).
• Implement error handling for cases where the video file is missing or cannot be loaded.
• Test the video file loading functionality by running the module with various video files and displaying the frames.