App to take individual pictures of a group of people attending a meeting

New developer here (be gentle).

I’d like to create an app and put it up in the marketplace that does the following:
At regular intervals, take pictures of the participants in the meeting.
At the end of the meeting, send the pictures to the administrator or maybe the host so funny effects can be added to the pictures.

This is my first post and I don’t know which kind of API I should look into (SDK? Video?),
Which language is preferable? I am fluent in a bunch of them and can easily learn anyone
What kind of license do I need?
Can this be done for free? I am an individual, not a company

I really appreciate the help