Hello tlow87,
Currently, I can’t reach your website so I can’t check the issue.
By the way, try this: go on Appearance -> Customize -> Video Settings and make sure that the first two options are set to ON.

https://imgur.com/a/NjyIl

Furthermore, check if your post format (inside each post) is set on VIDEO

https://imgur.com/a/J3R9p

Hope this can help you.
All the best,

Andrea

Hello tlow87,
in order to help you with the problem I need you:

• a screenshot of your customizer page on video settings tab
• a screenshot of your backend of the post that doesn’t work
• link of your website (the one you provided doesn’t work)

Thanks,
Andrea

Hello tlow87,
as stated on Themeforest before you bought Vlogger’s Theme, we can’t deal with archive.org videos embedding or with sites in general that don’t permit hotlinking or XSS protection. It’s not a theme issue so we can’t get through of it.

Have you tried asking information to archive.org about embedding its videos on other websites?

Kind regards,
Andrea

Hello and thanks for your update.
It is possible that WordPress itself can provide a standard embedding in the content of the post, but to display the video in the headers we need to process all the embedding functionality through custom theme functions.
For this reason adding a new service is not a simple task, and as for now we had this request only from you, I’m sorry to say that we can’t offer this a theme feature.

If you hire any developer from Codeable or Envato studio to process your request we can get in touch with him to provide valuable information relative to the functions location in the theme structure and how to proceed for a correct implementation, but such function can for sure have some development cost.

Best regards
Igor