BoinxTV with Decklink Extreme 3D & SE-800 to Livestream

I would like to use BoinxTV to create CG and graphics overlaid on the live output from a Datavideo SE-800 switcher using a Decklink Extreme 3D. I’d like to send the output to both an external tape deck and to a live Livestream channel.

Does anyone know if this is possible? What other hardware or software might be needed?

I plan to use a Mac Pro desktop dual quad core with 4GB RAM.

Any thoughts, advice or ideas?

That’s possible.
First: Is there a reason why you send it to a tape deck instead of recording to disk?
The best performing software solution to live stream the BoinxTV output is the third-party application Camtwist. You’ll find a tutorial at: http://bitnapping.tv/episodes/2010/5/5/bitnappingtv-094-streaming-with-boinxtv.html
The second possibility that takes a lot of load off the machine would be an external streaming box like the Terade Cube, see http://www.boinx.com/chronicles/2011/9/30/streaming-from-boinxtv-with-the-teradek-cube/

Erik, let me understand. Do you want to superimpose externally or you want to capture, add graphics and after playout? We tried bot solution and I have good skills in, let me know what exactly do you need