Some terminal emulators are capable of showing bitmap images directly
inside the terminal. One popular way of doing it is by using Sixel
(https://en.wikipedia.org/wiki/Sixel), which can be used to show
animations. This step is about integrating a Sixel or an equivalent
feature to display the video of A/V calls directly in the terminal.
Implement Sixel or equivalent technology
when a compatible terminal is detected, the video output should
be by default on Sixel (with options to use GUI)