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```python
# AI Dev Tool: Spymarks Video Watermark Detector
# =============================================
# Detects and removes spymarks from AI-generated videos

import cv2
import numpy as np
from typing import List, Tuple

def detect_spymarks(video_path: str) -> List[Tuple[int, int, int, int]]:
    """
    Detects spymarks in a given video.

Args:
    video_path (str): Path to the video file.

Returns:
    List[Tuple[int, int, int, int]]: List of spymark coordinates (x, y, w, h).
    """
    # Initialize video capture
    cap = cv2.VideoCapture(video_path)
    
    # Check if video file was opened successfully
    if not cap.isOpened():
        raise IOError("Error opening video file")
    
    # Initialize spymark detector
    spymark_detector = cv2.createBackgroundSubtractorMOG2()
    
    # Initialize list to store spymark coordinates
    spymark_coords = []
    
    # Iterate over video frames
    while True:
        ret, frame = cap.read()
        if not ret:
            break
        
        # Apply spymark detection
        fgmask

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