Example of Python with Opencv and camera face detection - repo complete https://github.com/radames/python_opencv_camera_haar

python_opencv_camera_haar.py

import cv2

cap = cv2.VideoCapture(0)
cap.set(3, 640)  # WIDTH
cap.set(4, 480)  # HEIGHT

face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + "haarcascade_frontalface_default.xml")
eye_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + "haarcascade_eye.xml")

while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()

    # Our operations on the frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray, 1.3, 5)
    print(len(faces))
    # Display the resulting frame
    for (x, y, w, h) in faces:
        cv2.rectangle(frame, (x, y), (x+w, y+h), (255, 0, 0), 2)
        roi_gray = gray[y:y+h, x:x+w]
        roi_color = frame[y:y+h, x:x+w]
        eyes = eye_cascade.detectMultiScale(roi_gray)
        for (ex, ey, ew, eh) in eyes:
            cv2.rectangle(roi_color, (ex, ey), (ex+ew, ey+eh), (0, 255, 0), 2)

    cv2.imshow('frame', frame)
    k = cv2.waitKey(1)
    if k == ord('q') or k == 27:
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

hi @Mariela1817 maybe you can try this

pip install opencv-contrib-python

hi i am getting this error:

mouth = mouth_cascade.detectMultiScale(roi_gray)
for (mx, my, mw, mh) in mouth:
cv2.rectangle(roi_color, (mx, my), (mx + mw, my + mh), (0, 0, 0), 2)

error: OpenCV(4.3.0) C:\projects\opencv-python\opencv\modules\objdetect\src\cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'

and i have already used this code:
mouth_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_mcs_mouth.xml')

but its still not working