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I found a workaround... If i add an iframe having the css class "ql-video", the iframe tag won't be removed.
That's not a really beautiful way but i will go for that now. If you remove that security flaw, please add the possibility to not only upload a video but also to embed a hosted one.
<iframe class="ql-video" frameborder="0" allowfullscreen="true" src="mvideoplayer.html"></iframe>