Keyframing? What do you mean? Maby you mean rotoscoping? Please give us some more info of what you wish to do and what is your issue?
Please show us a screen grab of a problem frame in the video. I am not about to install some download service I've never heard of just to dignose three seconds of video.
Its an anime animation Dave.
Should be easy to Rotobrush if you work with the BG. (alt -rotobrush)
The character has a convenient key line to work up to.
Take a look at Rotobrush Tutorial - Adobe TV