How can I monitor all the subdirectories in watchdog?

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Python

import os
import sys
import time
import logging
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

def monitor_folders(folder_name, transfer):
    def on_created(event):
        print(f"Filesystem is Created in {folder_name}")
        os.system(f"rsync -a {folder_name} {transfer}")

    event_handler = FileSystemEventHandler()
    event_handler.on_created = on_created

    observer = Observer()
    observer.schedule(event_handler, folder_name, recursive=True)
    observer.start()
    try:
        print("Monitoring")
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
        print("Done")
    observer.join()

if __name__ == "__main__":
    path = "/home/bilal/Videos/folder1/"
    newPath = "/home/bilal/Videos/folder2/"
    monitor_multiple_folders(path, newPath)

What I have tried:

In this code, I am monitoring a path, and when a new file is created, the file should transfer to the newPath. The code is working fine but my question is that, how can I monitor all the subdirectories that are present in the parent directory?

I used LoggingEventHandler to watch subdirectories but it was not flexible to give me a way to transfer files to another path.