Multiple separate selfies combined in one screenshot

Hi I’m looking for a tool that allows attendees in a virtual event to take selfies separately and then the tool would collect all their selfies in one screenshot. Similar to p.20 of this guide https://material-exchange.com/wp-content/uploads/2020/07/Run-The-World_Speaker_Guide.pdf but that's a complete platform. I just want a tool that can be used for Zoom conferences.