Generate a graphical user interface using pyqt5 and designer. In it there must be two buttons. One called "Start liveview" and the other called "Stop Liveview". When the first one is pressed, an image acquired by the Thorlabs zelux camera should be transmitted live. This image should be displayed using GraphicsLayoutWidget, and a pyqtgraph ImageItem. Then when the second button is pressed, the image stops streaming.

def gui():
    # We need to use a QT application to display an image
    app = QtGui.QApplication([])
    # Create a window to add widgets to
    win = QtGui.QMainWindow()
    # Create the main widget
    main = QtGui.QWidget()
    # Create the layout
    layout = QtGui.QVBoxLayout()
    # Add widgets to the layout
    layout.addWidget(button)
    layout.addWidget(i)
    # Set the layout to the main widget
    main.setLayout(layout)
    # Set the main widget to the window
    win.setCentralWidget(main)
    # Show the window
    win.show()
    # Run the QT application
    app.exec_()