people detection and counting using opencv and yolov4 code but the code is not showing anything

Question

Im working in project for people detection and counting using opencv and yolov4 but the code is not showing anything when i run it and immediately closed , i dont know if wrote something wrong or am i missing a thing , help me.

this is my code :

import cv2
import numpy as np

# Define the motion history time window in seconds
MOTION_HISTORY_TIME_WINDOW = 2.0

def detect_people(frame, net, classes, colors):
    height, width, channels = frame.shape
    blob = cv2.dnn.blobFromImage(frame, 1 / 255, (416, 416), (0, 0, 0), True, crop=False)
    net.setInput(blob)
    outputs = net.forward(net.getUnconnectedOutLayersNames())

    boxes = []
    confidences = []
    for output in outputs:
        for detection in output:
            scores = detection[5:]
            class_id = np.argmax(scores)
            confidence = scores[class_id]
            if confidence > 0.5 and classes[class_id] == "person":
                center_x = int(detection[0] * width)
                center_y = int(detection[1] * height)
                w = int(detection[2] * width)
                h = int(detection[3] * height)
                x = int(center_x - w / 2)
                y = int(center_y - h / 2)
                boxes.append([x, y, w, h])
                confidences.append(confidence)

    return boxes, confidences

def main():
    net = cv2.dnn.readNetFromDarknet("yolov4.cfg", "yolov4.weights")
    classes = []
    with open("coco.names", "r") as f:
        classes = [line.strip() for line in f.readlines()]
    colors = np.random.uniform(0, 255, size=(len(classes), 3))

    cap = cv2.VideoCapture("http://192.168.0.103:8080/video")
    try:
        people_counter = 0

        # Initialize the motion history dictionary
        motion_history = {}

        while True:
            print("Reading frame...")
            ret, frame = cap.read()

            if not ret:
                break
            print("Frame read successfully")
            print("Performing people detection...")
            boxes, confidences = detect_people(frame, net, classes, colors)

            if len(boxes) > 0:
                print("Drawing bounding boxes and updating people counter...")
                # Draw the bounding boxes and update the people counter
                for box, confidence in zip(boxes, confidences):
                    cv2.rectangle(frame, box, colors[np.argmax(confidence)], 2)

                    # Calculate the center position of the person
                    center_x, center_y = int(box[0] + box[2] / 2), int(box[1] + box[3] / 2)

                    # Calculate a unique identifier for this person
                    person_id = f"{center_x}:{center_y}"

                    # Update the motion history for this person
                    if person_id not in motion_history:
                        motion_history[person_id] = []
                    motion_history[person_id].append((center_x, center_y))

                    # Remove old positions from the motion history
                    motion_history[person_id] = motion_history[person_id][-int(np.ceil(MOTION_HISTORY_TIME_WINDOW / cap.get(cv2.CAP_PROP_FPS))):]

                    if len(motion_history[person_id]) == 1:
                        people_counter += 1

            # Display the output frame and the people counter
            cv2.putText(frame, f"People: {people_counter}", (10, 30), cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255), 2)
            cv2.imshow("People Counter", frame)

            # Exit the loop when the 'q' key is pressed
            if cv2.waitKey(1) & 0xFF == ord('q'):
                break

    finally:
        # Release the IP camera stream and destroy all windows
        cap.release()
        cv2.destroyAllWindows()

i added a print function to check my frame as :

 while True:
            print("Reading frame...")
            ret, frame = cap.read()

            if not ret:
                break
            print("Frame read successfully")
            print("Performing people detection...")

i was waiting one of the print fuction work but non of it showed when i was running the code .

and this was the result :

%Run peopleYOLO.py

i already installed yolov4.cfg,yolov4.weights and i uninstalledthe packages and reinstalled it again and nothing appeard , i change also cap = cv2.VideoCapture("http://192.168.0.103:8080/video") to a video path not url and the same problem .