I finally got this job.
First insert your YouTube video like this:
<iframe class="embed-responsive-item" src="https://www.youtube.com/embed/XL9528Gohe0?autohide=1&playsinline=1&showinfo=0" frameborder="0" allowfullscreen=""></iframe>
Then close Xcode and edit the config.xml file (usually in the root directory of your project).
Add this line under other settings:
<preference name="AllowInlineMediaPlayback" value="true" />
Save it, rebuild the project, open it in Xcode and run it again. Your YouTube video should now be embedded. Tested on the latest version of iOS (9.1) on iPhone 6.
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