How to swipe between cameras using CustomVideoCapturer in OpenTok SDK Android

Question

I am using OpenTok SDK for android and trying to add camera switch between front and rear camera of the phone. I am able to perform this using default camera capture but I need to implement a custom video capture to enable autofocus. However I am having trouble switching between cameras while using the custom video capture

Here is a link to the custom video capture I use.

and this is how i build publisher using custom video capture

mPublisher = new Publisher.Builder(getActivity())
            .name("publisher")
            .capturer(new CustomVideoCapturer(getActivity()))
            .resolution(Publisher.CameraCaptureResolution.HIGH).build();

I use mPublisher.swapCamera() or mPublisher.cycleCamera() to switch between cameras. they work fine while using default video capture.but with custom video capture they don't function.

Is there specific method I need to override while using custom video capture ?