So, I am trying to imbed a video in an iframe. The problem is, the video I need is already imbedded in a channel. My code looks like this:

    <div class="video-container">
        <iframe width="420" height="315"
            src="https://thewebsite.net/embed/channel/xxxxxx?wchannelid=xxxxxxx&amp">
        </iframe>
    </div>

I have tried putting the exact video link in the iframe: https://thewebsite.net/embed/channel/xxxxxx?wchannelid=xxxxxxx&wmediaaid=xxxxx But it does not work. I can only get the website to be imbedded then click on videos from there with the code above.
I need it to go to a specific video, auto fullscreen, disable interaction with the user until it is finished, autoplay, then be able to be closed.
To give more context, the videos on the website itself are popups, you cannot open them in their own page.
I know that I can’t put a video tag or another iframe tag inside my iframe already, any ideas?
This is HTML5.

I have already tried video tags too.