inference/detect_webcam.py

from ultralytics import YOLO
import cv2

model = YOLO("runs/detect/weights/best.pt")

cap = cv2.VideoCapture(0)  # 0 = default webcam
while cap.isOpened():
    ret, frame = cap.read()
    if not ret: break

    results = model(frame, conf=0.5, imgsz=640, augment=False)
    annotated_frame = results[0].plot()

    cv2.imshow("Webcam Detection", annotated_frame)
    if cv2.waitKey(1) == ord('q'): break

cap.release()
cv2.destroyAllWindows()