Have you looked into the requirements when using rtmp? You need to connect your rtmp app to a rtmp server (typically hosted on internet where there are various providers, I think youtube supports this as well)
This article, even though ment for IPhone, is very informative
If you then can view your camera in this way, from youtube or other, you should be able to use the same url in the iframe. But direct rtmp connection to the dashboard, no I think that is not possible (unless you can find or invent a node written as a rtmp server)
EDIT: Well, there seem to be a node-media-server supporting rtmp available, maybe this is a starting point for having your local rtmp server
It seems you can even have a local rtmp server running on a raspberry pi....
