Can't scroll on an embedded video

When a video is embedded on the page (via VideoJS or iframe), you can't scroll "on" the video. This means that if there is one or multiple videos taking up the whole of your screen space, you can be left with nowhere to scroll.

To reproduce:

• Embed a video (YouTube, or MP4) on a course page, using either/both VideoJS and embedded iframe
• Access the course via mobile app
• Scroll down the page with the video
• Try to scroll on the embedded video

Expected:

You should be able to scroll on the video, like you can on a website with an embedded video.

Actual:

Can't scroll by going over the video, only on the white space around the video.