Some video streaming site will hide the download link behind a blob format which will get resolved internally. If you inspect the video player in Chrome you can see something like this:
<video class="jw-video jw-reset" tabindex="-1" disableremoteplayback="" webkit-playsinline="" playsinline="" src="blob:https://play.vstreamplay.xyz/1c36398f-c376-4873-a0ac-7fa07c3968f7"></video>