from PyQt5 import QtWidgets as qtw from PyQt5 import QtCore as qtc from PyQt5 import QtMultimedia as qtmm from PyQt5 import QtMultimediaWidgets as qtmmw class MainWindow(qtw.QWidget): def __init__(self): super().__init__() self.setLayout(qtw.QVBoxLayout()) # camera self.camera = qtmm.QCamera() # viewfinder cvf = qtmmw.QCameraViewfinder() self.camera.setViewfinder(cvf) self.layout().addWidget(cvf) # Form form = qtw.QFormLayout() self.layout().addLayout(form) # zoom zoomslider = qtw.QSlider( minimum=1, maximum=10, sliderMoved=self.on_slider_moved, orientation=qtc.Qt.Horizontal ) form.addRow('Zoom', zoomslider) self.camera.start() self.show() def on_slider_moved(self, value): focus = self.camera.focus() focus.zoomTo(1, value) if __name__ == '__main__': app = qtw.QApplication([]) mw = MainWindow() app.exec()