Coding for a video with allowfullscreen

[LeslieJohnsonAeris]

We've been using this utility successfully for a few years now, thank you! One issue has come up with our links to videos.
I use Oxygen XML Author to write in DITA, then use zpu to transform and publish on Zendesk. The transformation renders the allowfullscreen parameter useless in Zendesk. My question is how can I code this in DITA to transform to an iframe with the allowfullscreen parameter?

Here is an example of code in a DITA file to view a video:

After running through ZPU, in ZENDESK, this results in the following HTML code:

When viewed in Zendesk, the allowfullscreen option does not work. The user cannot expand the video to full screen.

I'm looking for DITA coding that will result in something like the following, which does work in Zendesk.

<iframe src="https://biglongaddress/UsageAnalyticsWalkthrough.mp4" width="665" height="500" allowfullscreen> </iframe>