This functionality is not possible in Connect. If there is something displayed in the meeting room, eveyone sees it. In some cases you can use the Presenter Only Area (POA), but you can't have multiple Video pods so it is either visible to all or just to Hosts & Presenters in the POA.
There are third party solutions that should be able to do this. I belive the Vantage Point tool from RefinedData is one example: Vantage Point - Refined Data