Using Zoom as your live streaming software will allow you some additional functionality that tools like OBS or Streamlabs lack like:
- Audience Q&As
- Co-hosting - Maybe you want to have a live chat with a peer in another city and want to broadcast both your webcams and audios into a single stream.
- Shared Presenting - More than one admin can control stream settings.
- Audience Audio Sharing - You can let specific audience members speak with audio at times you choose.
If you're just looking to co-host with Zoom you can use their meeting feature. If you want an audience to be able to have a Q&A with you, you'll need their webinar add-on. This has an additional cost and various tiers of attendees. The lowest tier is 100 attendees, so you could always provide the 100 first registrations for your live event direct access in Zoom and then the rest can view the live stream via Uscreen.
In Zoom you'll need to enable Custom Live Streaming Services which is really just enabling the RTMP protocol.
Navigate to Admin > Accounts Settings and click on In Meeting (Advanced)
Then scroll down to Allow live streaming meetings and toggle it on. Make sure you also toggle Custom Live Streaming Service.
In your Zoom meeting, click on ...More and select Live on Custom Live Streaming Service. Enter your Stream URL, Stream Key, and Live Stream Page URL from Uscreen. You can find your Live Stream Page URL under the SEO tab on the live event.
You'll be live and you can go back into Uscreen to test the stream: