Here's a video Tutorial on how to set up beat sync live camera in your video mix using VDMX and how I plug serato DJ with M.E video plug-in ( works the same way for Serato video to )
Into VDMX using Syphon

Watchvimeo.com

I did this video for a friend who I have been helping to set up live cameras in his video mix's
I will post the video here and...
I hope some other people find it helpful too...