Technically possible, but the feed would have to be streamed in a format that could e viewed on a Roku - either HLS or Microsoft Smooth. So essentially you would have to run the feed through a transcoding system (like Plex, PlayOn, a Wowza server, Flash Media Server) either in the cloud or in your living room and then stream it to a player. On the player you would use roVideoPlayer with either roImageCanvas or roScreen to display an overlay on top of the video.
- Joel