Project [ iPhone, iPad, Android ] Video Group Calling

Hello , I need a really good company to developing the best VIDEO CALLING GROUPS app for IOS [ ALL Version including ios 8 + android ] The program will have alot of API that we will use it and we will make it so professional so if you gonna bid , but in your mind that there is nothing is impossible and I want this app really perfect app as what i want it The details is private and I need to see from the bidders the best app that they did built it. And i'll choose the best one.