Adding a text vertical to a camera angle

[Higuchi]

Hi guys,

I'm looking for the way to add texts on the image or the animation. I know a way, described on the link below, where geometry model and opacity are used well. But, in that way, angles are limited to geometrical, because model should be aligned vertically with the camera angle.
https://www.youtube.com/watch?v=XfumqEmmfec

Do you know another ways to automatically align the model vertically with the camera angle? Or, fundamentally another method to make it?

By the way, I know the way that I make use of front plate on image tab. But, it doesn't enables me to add on dynamic animation.