如何调用系统相机，拍照、录视频？

/**
 * 调用系统相机，拍照、录视频
 * @param options
 * @returns
 */
static async camera(options?: CameraOptions): Promise<string> {
  try {
    if (!options) {
      options = new CameraOptions();
    }
    if (!options.mediaTypes || options.mediaTypes.length == 0) {
      options.mediaTypes = [cameraPicker.PickerMediaType.PHOTO, cameraPicker.PickerMediaType.VIDEO];
    }
    let pickerProfile: cameraPicker.PickerProfile = {
      cameraPosition: options.cameraPosition ? options.cameraPosition : camera.CameraPosition.CAMERA_POSITION_BACK,
      videoDuration: options.videoDuration,
      saveUri: options.saveUri
    };

    let context = getContext() as common.Context;
    let pickerResult: cameraPicker.PickerResult = await cameraPicker.pick(context,
      options.mediaTypes, pickerProfile);
    if (pickerResult && pickerResult.resultUri) {
      return pickerResult.resultUri;
    }
  } catch (err) {
    let error = err as BusinessError;
    LogUtil.error(`PickerUtil-camera-异常 ~ code: ${error.code} -·- message: ${error.message}`);
  }
  return "";
}