test.py

import cv2
import mediapipe as mp

mp_hands = mp.solutions.hands.Hands()
cap = cv2.VideoCapture(0)

while True:
    ok, frame = cap.read()
    if not ok: break
    rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    out = mp_hands.process(rgb)
    if out.multi_hand_landmarks:
        for hand in out.multi_hand_landmarks:
            h,w,_ = frame.shape
            xs = [lm.x * w for lm in hand.landmark]
            ys = [lm.y * h for lm in hand.landmark]
            x1,y1,x2,y2 = int(min(xs)), int(min(ys)), int(max(xs)), int(max(ys))
            cv2.rectangle(frame, (x1,y1), (x2,y2), (0,255,0), 2)
    cv2.imshow("hand bbox", frame)
    if cv2.waitKey(1) == 27: break