latching relay to pass continuity

I am looking to use a latching relay to pass a continuity (activating a video trigger) with a separate pulse point for open and closed.  I was Looking at the "Momentary to constant ouput" relay diagram, as a starting point and adding a third NC relay to interupt ground to reset the system and I would run both outputs from a - pulse on a remote.  My thinking is that relay 2 would pass the continuity after being triggered by number one, or would this just end up being momentary?

Is this possible. 

Thanks for any help and humoring a newbie

hotwaterwizard wrote:

This diagram will not work as shown, but if you swap the leads going to pins 30 and 87 on the top relay, it will.  

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The constant 12v  at the first relay will pulse relay number one and two. I have no Idea where I got this Diagram it is not Logical.

Just put another relay where the Light Bulb is use pins 85 and 86, Then it will switch Audio or video.

you can do this with a single normal relay and a stop and start momentery botton.