delete frame or cut footage via script

Hello, I am kinda stuck.

What I'd like is to go through individual frames via scripting of a movie file and delete some frames based on some criteria.  How may this be done?

1. How to traverse through the movie footage frame by frame through a loop

2.  Delete a frame

3.  Cut a section of the movie and delete it

I've searched a lot and could not find anything about this doing it from a script.  Which functions or properties should I look at?

Thanks for your assistance