For future reference, if you look carefully at the documentation for the CE addon and compare it to the command that jitterjames shared above, it should help you to figure out how to build commands from scratch in the future.
You wanted to know how to start the addon script using a voice command, so the part of the CE documentation you need to look at is:
http://wiki.xbmc.org/index.php?title=Add-on:Cinema_Experience#Script_Starting_Methods (in particular, section 5.3.1.2 - Movie ID).
It's not really a lot of code, but just one line. As you can see by looking at the command jitterjames provided, in VC this is implemented via the XJson.Raw action.
A helpful place to start is to look for similar commands that came in your VC configuration when you installed it.
There is, for example, a command group called "XBMC Addons", in which there is already a command -- "download subtitles" -- that uses very similar syntax to that specified in the documentation for the Cinema Experience Addon. That would have made a good starting point. After that, the only VC-specific aspect one needs to understand is how to use payloads.
jitterjames is a wizard at providing us with custom commands at short notice, but in the long run that can make it difficult to understand what's happening.