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The autoplay is set by whatever internal server you use to serve the video. So it must be disabled on the source for the Iframe.
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I have been trialling your add-in, I’m not sure why your add-on is any better. The prime thing we’re trying to do is stop cross-site scripting by only allowing specific videos or sites to embed videos on our Confluence pages. Please can you explain how your app beats what Confluence has built-in?
Assuming that this is about the whitelisting functionality in Iframes for Confluence.
The main difference is that we support any content, not only what is listed at https://confluence.atlassian.com/doc/widget-connector-macro-171180449.html
We also support extra macro parameters, in particular Admin controlled Sandboxing allows you more fine grain control of what can be done in the app.