Inspect element and try to find a video URL. Sometimes it's very easy and you get a static video URL that you can access at any time. Other times you may get a video URL that expires very quickly, so you may need to write a script to extract + download from the video URL as soon as the page loads. Sometimes the video is served in chunks, I don't know how to deal with these.

And sometimes you can just give the URL to youtube-dl and it will handle everything for you.

Use a free screen recording software. Tho this works if you have a good enough GPU. it's worth a shot tho

Do you have the video url?

You can try giving it to eat to yt-dlp?