Hey @VPASCUAL, from the VMware Communities, can you open System Preferences > Security & Privacy > Privacy > Camera and see if Fusion is listed. (Expected result is you can see Fusion exists in the list). Also, when the first time you open the camera application in Windows 10 guest, you should be able to see the prompt window like, "VMware Fusion" would like to access the camera.
If that doesn't work, maybe look into this VMware KB on Adding a Camera to a Virtual Machine
Let me know if this helps after giving access to Fusion? Then check if the camera is accessible? If not, suggest looking into the Windows portion of the Zoom Meetings support KBs on Troubleshooting Video Issues
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