This is a bit of a vague question that probably would work with a bit more spec.
In the beginning, I would probably use a 3rd party service & wrap it in your own apps because the streaming part is pretty unreliable & hard to do good QA on. The biggest video conferencing services still have problems so smaller ones always will.
Then you can focus on the quality of the apps & the user experience more/spend less.
This is a bit of a vague question that probably would work with a bit more spec.
In the beginning, I would probably use a 3rd party service & wrap it in your own apps because the streaming part is pretty unreliable & hard to do good QA on. The biggest video conferencing services still have problems so smaller ones always will.
Then you can focus on the quality of the apps & the user experience more/spend less.
Maybe something like digitalsamba.com/oem
Expertise: Streaming, not conferencing (but seems the same to me).