In order to broadcast, you would first need a separate iRacing account (

Once you have the iRacing software installed, you would access the camera view.

You would then need to use a third party application to broadcast. 

Here are two examples and videos that may be helpful:

Or if you looking to hire someone for your event, you can try RaceSpot and Podium.

This is iRacing's official broadcasting policy as of April 2, 2021: