According to the Zoom official website, Full HD 1080p video is limited to Business and Enterprise plans.
You can still enable HD video to get 720p (1280 x 720). However, you need to request 1080p access from Zoom. They'll enable it for you if you're eligible.
https://support.zoom.us/hc/en-us/articles/207347086-Using-Group-HD-video
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