animation camera trajectory json creation

[Kin-Zhang]

Hi,
I'm wondering how to create a camera_trajectory.json for a video animation. Like there is an example in the code and already have many parameters (total 40) here:

I'm wondering if could we set serval points and make an animation automatically.

[Kin-Zhang]

I think I figure out somehow in another way, will add more detail here for afterward people.