in times of corona in homeoffice and a lot of websessions it’s a nice feature to hide your background or change carpet color
teams
offer “background effects” to insert custom image to live video, at windows add your custom image here
%APPDATA%\Microsoft\Teams\Backgrounds\Uploads

zoom
called as virtual backgrounds it is also possible to hide real background, for multiple os and even with custom files

webex
called as video background it is for suce possible to add custom background, since a few days also for iOS devices
… and many many more