screen_capture.py

import numpy as np
import cv2
from PIL import ImageGrab
from screeninfo import get_monitors

monitors = []
for m in get_monitors():
    monitors.append((m.x, m.y, m.x + m.width, m.y + m.height))

bbox = monitors[0]

while True:
    img = ImageGrab.grab(bbox=bbox)
    img_np = np.array(img)

    frame = cv2.cvtColor(img_np, cv2.COLOR_BGR2RGB)

    cv2.imshow("Screen", frame)

    key = cv2.waitKey(1)
    for i, m in enumerate(monitors):
        if key == i + 49:
            bbox = m

    if key == 27:
        break

cv2.destroyAllWindows()