Watermark or composite image onto frame

Not sure if this would be more part of Kurento but I can see the need in my business to add a watermark/logo to the stream which is embedded in the video. Does this exist? And is this difficult to do?

Take a look to filters:


You can use gdkpixbufoverlay filter to add an image.

Take into count this will increment CPU usage in the server.

Awesome will take a look