如何使用opencv在pyqt5中同时运行不同窗口中的一个摄像头

import cv2
from PyQt5.QtCore import Qt, QTimer
from PyQt5.QtGui import QImage, QPixmap
from PyQt5.QtWidgets import QApplication, QLabel, QMainWindow, QVBoxLayout, QWidget

class CameraWindow(QWidget):
    def __init__(self, camera_index):
        super().__init__()
        self.camera_index = camera_index
        self.camera = cv2.VideoCapture(self.camera_index)
        self.image_label = QLabel(self)
        layout = QVBoxLayout()
        layout.addWidget(self.image_label)
        self.setLayout(layout)
        self.timer = QTimer()
        self.timer.timeout.connect(self.update_frame)
        self.timer.start(30)

    def update_frame(self):
        ret, frame = self.camera.read()
        if ret:
            frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            image = QImage(frame, frame.shape[1], frame.shape[0], QImage.Format_RGB888)
            pixmap = QPixmap.fromImage(image)
            self.image_label.setPixmap(pixmap)
            self.image_label.setScaledContents(True)

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Multiple Camera Windows")
        self.camera_windows = []
        self.camera_windows.append(CameraWindow(0))
        self.camera_windows.append(CameraWindow(1))
        self.camera_windows.append(CameraWindow(2))
        self.setCentralWidget(self.camera_windows[0])

if __name__ == "__main__":
    app = QApplication([])
    main_window = MainWindow()
    main_window.show()
    app.exec_()