Hi,
I'm still able to embed a video in the TZ Portfolio+ article's content with the Editor-TinyMCE.
In this case, you just need a small configuration. Please go to admin > extensions > plugins > Editor-TinyMCE > Look for "Prohibited elements" > delete "iframe" > then save. After that, you can try to embed the video's iframe in the article content again.
You're supposed to configure this option in 3 sets (set 0, 1, 2). Please see the attachment.
Hope it's useful!
Best regards,