Using webcam in apps?

Hi all, my name is Levi.
I'm generating an idea for an app and I want to know how hard it would be to have an app with video chat capabilities.
it would be designed to be a link between an iPad user and someone on a computer. The iPad user would see the main view of the other person, as well as a small box with zoom, and a text box that opens and closes from the side.
The computer user would see just the iPad user's cam and a text box.

Is it possible to use Skype or facetime to do this?
Is it particuarly hard to hire a developer to go a good job at this?
Any problems with bandwidth?

Apart from the in-app video call, the app would have a couple of other windows with information, downloads, settings.

Thanks in advance
Levi.