Once you are in Zoom,

1. Sign in to the Zoom web portal as an administrator with permission to edit Account settings, and click Account Settings.
2. Navigate to the Virtual Background option on the Meeting tab and verify that the setting is enabled.
   Note: If the setting is disabled, click the Status toggle to enable it. If a verification dialog displays, choose Turn On to verify the change.
   
3. Note: Users must logout of the Zoom Desktop Client and login to it again for this setting to take effect.

IMAGES/VIDEO REQUIREMENTS

BACKGROUND IMAGE
an aspect ratio of 16:9
minimum size of 1280 by 720 pixels
Find royalty-free images at: Pexels, Unsplash, Pixabay

BACKGROUND VIDEO
MP4 or MOV file
minimum resolution of 480 by 360 pixels (360p)
maximum resolution of 1920 by 1080 pixels (1080p)