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https://github.com/lucasw/rviz_textured_quads could do what you want though you would have to create a tf child of the camera pose at the desired distance to the camera tf. The texture would be provided via an image topic. The core code is in fact a couple steps removed from that DRC plugin @stefan-kohlbrecher links to, but I wanted a simple image topic on only a rectangle interface, maybe the general Mesh projection could be re-introduced later or be in a different plugin.

Also answered in a similar question here: http://answers.ros.org/question/227304/dynamic-texture-in-rviz/