title: How to play video in a QVideoWidget promoted in Qt Designer?
body: <p>I am a beginner in Qt. But following some tutorials I created a UI in qt designer which would display a live stream video. I have read that in order to add video i need to promote widget to a QVideoWidget. Then I convert the .ui to a .py file to access it using python language. The thing is once i have done that i dont know how to put the video in the widget that i made in the ui. Thank you.</p>
  
  <p>The code below show the GUI.py file. I am importing it in another file where I would code it show the video. but dont know how thanks</p>
  
  <pre><code># -*- coding: utf-8 -*-
  
  # Form implementation generated from reading ui file 'facebio.ui'
  #
  # Created by: PyQt5 UI code generator 5.6
  #
  # WARNING! All changes made in this file will be lost!
  
  from PyQt5 import QtCore, QtGui, QtWidgets
  
  class Ui_MainWindow(object):
      def setupUi(self, MainWindow):
          MainWindow.setObjectName("MainWindow")
          MainWindow.resize(558, 388)
          self.centralwidget = QtWidgets.QWidget(MainWindow)
          self.centralwidget.setObjectName("centralwidget")
          self.listWidget = QtWidgets.QListWidget(self.centralwidget)
          self.listWidget.setGeometry(QtCore.QRect(280, 10, 261, 221))
          self.listWidget.setObjectName("listWidget")
          self.listWidget_2 = QtWidgets.QListWidget(self.centralwidget)
          self.listWidget_2.setGeometry(QtCore.QRect(20, 240, 521, 101))
          self.listWidget_2.setObjectName("listWidget_2")
          self.widget = QVideoWidget(self.centralwidget)
          self.widget.setGeometry(QtCore.QRect(20, 10, 241, 221))
          self.widget.setObjectName("widget")
          MainWindow.setCentralWidget(self.centralwidget)
  
          self.retranslateUi(MainWindow)
          QtCore.QMetaObject.connectSlotsByName(MainWindow)
  
      def retranslateUi(self, MainWindow):
          _translate = QtCore.QCoreApplication.translate
          MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
  
  from PyQt5.QtMultimediaWidgets import QVideoWidget
  
  if __name__ == "__main__":
      import sys
      app = QtWidgets.QApplication(sys.argv)
      MainWindow = QtWidgets.QMainWindow()
      ui = Ui_MainWindow()
      ui.setupUi(MainWindow)
      MainWindow.show()
      sys.exit(app.exec_())
  </code></pre>