It would not be too hard to implement but the mjprox as it is made can only open the stream from a tcp socket.
Look maybe at the PHP variations to mjprox. It should be easy to implement then. The key elements are
Must be made either as an nph- cgi script, or as a program that sends the right headers to the browser so the stream becomes mjpeg and not text or html.
Must have a delay between each frame so the speed gets right.