Zoom meeting SDK with custom UI and in-built option bar

1

I have integrated Zoom meeting SDK and I need to show some custom UI. As per documentation provided here. I can still retain the option bar at the bottom along with all the functionality provided but the documentation is vague regarding it.

I am not able to figure out how to get a reference to the meetingOptionBar which I am assuming that is the bottom bar which contains all the functionality.

Any insight on how achieve a custom UI with the default option bar and its functionality?