asciinema.org is a free tool to record Terminal session. You can then upload those record and embed the 'video'.

Example of the embedded player code (better if supported by Hashnode) :

<script id="asciicast-uNfLlQ6q0K3GG0bbooyqf62ps" src="asciinema.org/a/uNfLlQ6q0K3GG0bbooyqf62ps.js" async></script>

Example of simple Markdown image link :

Thanks :)