Hey Mike, happy new year! yeah, Maya live leaves some things to be desired as they quit developing and supporting it after version 4.

you will have to export your video as an image sequence to have it read no matter what you do. And there aren't really any good tutorials out there on it if any at this point. I suppose I should ask if you are trying to get a 3d camera match out of some footage? If so, Live can do this, but be prepared for a fun ride. It's pretty buggy, and hard to wrangle stuff in with.
-Z