For documenting my attendance at a webinar for professional development, I wanted copies of slides that were posted in a JW Player format. Right-clicking the video wouldn’t allow me to download it, boo hiss.
Using Safari on my Mac, I pressed Option-Command-U to view the “Resources” and then clicked the “Elements” tab. I then hovered over the video feed and Safari highlights portions of the code that generate the content. Keep expanding the carrots/arrows until you drill down to the code generating the feed. In my case, it looked like this and I right-clicked the code to “Copy Link Address”: