OpenCV CUDA: GPU-Accelerated RTSP Stream Preprocessing

import cv2

cap = cv2.VideoCapture("rtsp://rtsplink.com/live/test?token=demo")
gpu_frame = cv2.cuda_GpuMat()

while cap.isOpened():
    ret, frame = cap.read()
    if not ret:
        break
    gpu_frame.upload(frame)
    gpu_gray = cv2.cuda.cvtColor(gpu_frame, cv2.COLOR_BGR2GRAY)
    gpu_resized = cv2.cuda.resize(gpu_gray, (640, 360))
    result = gpu_resized.download()
    cv2.imshow("CUDA Stream", result)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break