Keeping rendering the video in pause mode

When -pauseCameraCapture is called, the processVideoSampleBuffer will ignore any incoming requests until -resumeCameraCapture is called.

While this behaviour result will indeed pause the camera from capturing, it will limit the ability to modify the active filter  during the pause. Any update to the filter parameters will not be rendered.

This update will save the last frame before the pause and will render the filter on top of it during pause instead of ignoring the update.