Here's our intro screencast that happens to explain how to use Meet Cam with Zoom:

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/034801eb-0e10-4197-a129-c8adad26905e/choose-meet-cam-camera-in-zoom.mp4

It's good idea to turn off "Mirror my video" option in Zoom, because otherwise you will feel like whatever Meet Cam adds is flipped horizontally.

Don't worry - with mirror turned on it's like that for you only.

People on the call see everything correctly regardless of that option being on or off.