Thanks everyone for taking the time to offer advice and support. I have to leave soon and I will consider everyone's input. I know that he needs to know that he can't keep doing this and my concern is probably partly a control thing - once I do the video (THAT is probably part of the nerve thing too, I am EXTREMELY uncomfortable speaking on camera) my control of the situation is gone. I want control over his sentence and control over the foolishness he might testify about; I know I don't have either.
With my children I am scared that they'll grow up thinking Mommy put Daddy in jail, or Daddy doesn't love me because he never comes around and that maybe a couple hours a week supervised visitation would be better than that.
All my worry will be for nothing if he takes off across the country which he has threatened in the past.