That's just using the blob API likely. Nothing stopping you src'ing an <img> tag with one of those.
If the page you're on can survive a reload, you can often find the interesting mp4/m3u8 request in the devtools network tab. You probably knew this already.
If the page you're on can survive a reload, you can often find the interesting mp4/m3u8 request in the devtools network tab. You probably knew this already.