You'll find the Sony Vegas Script SDK at http://download.sonycreativesoftware.com/dev/ It includes the Vegas Pro Scripting API Summary. Note that the namespace has changed from Sony.Vegas to ScriptPortal.Vegas from MAGIX' VEGAS Pro 13.0 Build 453 onwards.
You'll find the Sony Vegas Script SDK at http://download.sonycreativesoftware.com/dev/ It includes the Vegas Pro Scripting API Summary. Note that the namespace has changed from Sony.Vegas to ScriptPortal.Vegas from MAGIX' VEGAS Pro 13.0 Build 453 onwards.
I just checked there to see what was exposed to interact with the Multi-Cam features and it looks like (a) the API hasn't been updated since Vegas 10 and (b) there's nothing to access or manipulate the Multi-Cam functionality. Anyplace else to look?