The documentation for using the NetMeeting COM API can be found at the Microsoft Developer Network at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/netmeet/nm3com1_8m09.asp
A listing of all of the interfaces and objects that the API exposes can be found at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/netmeet/nm3com1_84c3.asp
Lastly, specific information regarding the video interface is listed at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/netmeet/nm3com1_23as.asp
Just read through this documentation and I'm sure you will be able to find the corresponding function calls that you need within your ActiveX Automation controller library to add this functionality to your CVI application.
Jason F.
Applications Engineer
National Instruments
www.ni.com/ask