Software like OBS, Vmix, Mimolive, Ecamm and others can add onscreen graphics to your Zoom camera using a virtual camera as your Zoom camera.
Hardware like video switchers can add backgrounds through chroma keying and on screen graphics like lower thirds using downstream keying. The hardware would be your camera in the Zoom app.
Black Magic Design, Ross, Newtek, Roland are some examples of companies that have hardware solutions.
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