JS-based group video call web application setup w/ customizing capability using CSS using the low-level api

Need a basic functional JS-based group video call web application setup, whereby I can use the low-level Jitsi API to manipulate, via CSS, the layout of the video elements in the UI.
I can’t seem to get this demo code working for me in adding participants.

Hi @Fredman65,

We can help you with your requirement.

I have sent you a DM. Please check it out.

Thanks