Private stream option for VIP users

im looking to impliment a simpe rpivate stream feature for only VIP paid users not normal users aka casters i have an overlay which iv a vip account holder wises to have no one see there chat they can unless the user is on casters friend list or ask's to join the channel to watch some pics attached ask for more info option would chuck a whole overlay across vid chat and cams under with button to to ask to join unless your already on that channel friend list