I'm sorry for my bad english, I'm learning. One problem of use Microsoft teams on linux is the background on webcam and share only one aplication, here is my solution:
We need OBS-STUDIO:
$ sudo apt install obs-studio
We need to create a virtual camera on OBS, for that exist the plugin v4l2loopback-dkms
$ sudo apt install v4l2loopback-dkms
After install the plugin, you see the option start virtual camera:
With this, you can share any scene that you create, for example, your navigator, it's simple by add source -> window capture, and select any window, 
click on Start Virtual Camera and teams show you OBS virtual camera
Until here, we have the solution for one problem, the second problem y show you with backgroung:
For thar we will use this repo:
https://github.com/nhtua/greencam/releases
This app show you how deploy a virtual green background for add chroma filter:
Final result, backgroung with images o applications.
