メソッド DisplayPropertyPage() を呼び出さずに、カメラ設定に直接アクセスできます。
FilterInfoCollection videoDevices =
new FilterInfoCollection(FilterCategory.VideoInputDevice);
VideoCaptureDevice videoDevice =
new VideoCaptureDevice(videoDevices[camDevice].MonikerString);
videoDevice.SetCameraProperty(
CameraControlProperty.Zoom,
zoomValue,
CameraControlFlags.Manual);
videoDevice.SetCameraProperty(
CameraControlProperty.Focus,
focusValue,
CameraControlFlags.Manual);
videoDevice.SetCameraProperty(
CameraControlProperty.Exposure,
exposureValue,
CameraControlFlags.Manual);