You need to do this (using OpenCV):
import cv2 as cv

cap = cv.VideoCapture(0)
while True:
    ret, frame = cap.read()
    frame = cv.resize(frame, None, fx=0.5, fy=0.5, interpolation=cv2.INTER_AREA)
    image = predict_draw_bounding_box(frame)
    cv.imshow('Output', image)
    c = cv.waitKey(1)
    if c == 27:
        break
cap.release()
cv.destroyAllWindows()

You need to create the predict_draw_bounding_box function to receive the frame and return the frame processed.