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import cv2
import numpy as np

cap = cv2.VideoCapture(0)
template = cv2.imread("bildklein.jpg", cv2.IMREAD_GRAYSCALE)
w, h = template.shape[::-1]

while True:
    _, frame = cap.read()
    gray_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    res = cv2.matchTemplate(gray_frame, template, cv2.TM_CCOEFF_NORMED)
    loc = np.where(res >= 0.7)

    for pt in zip(*loc[::-1]):
        cv2.rectangle(frame, pt, (pt[0] + w, pt[1] + h), (0, 255, 0), 3)

    cv2.imshow("Frame", frame)

    key = cv2.waitKey(1)

    if key == 27:
        break

cap.release()
cv2.destroyAllWindows()