如何将可变视频呈现到PyQt小部件？

from PyQt5.QtCore import QThread, Qt, QUrl
from PyQt5.QtWidgets import QApplication, QLabel, QVBoxLayout, QWidget
from PyQt5.QtMultimedia import QMediaPlayer, QMediaContent
from PyQt5.QtMultimediaWidgets import QVideoWidget

class VideoThread(QThread):
    def __init__(self, video_path):
        super().__init__()
        self.video_path = video_path

    def run(self):
        self.player = QMediaPlayer()
        self.player.setMedia(QMediaContent(QUrl.fromLocalFile(self.video_path)))
        self.player.setVideoOutput(self.video_widget)

        self.player.play()

class VideoWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.layout = QVBoxLayout()
        self.video_widget = QVideoWidget()
        self.layout.addWidget(self.video_widget)
        self.setLayout(self.layout)

        self.video_thread = VideoThread('video_path')
        self.video_thread.video_widget = self.video_widget
        self.video_thread.start()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = QWidget()
    layout = QVBoxLayout()
    video_widget = VideoWidget()
    layout.addWidget(video_widget)
    window.setLayout(layout)
    window.show()

    sys.exit(app.exec_())