Right now I have a script that selects area between two diffrent paths (that have same number of strokes and points but might be different scale).
How I am doing it is simply using existing points to define the surface but it's inaccurate in this case.
See in blue, is what i am doing but the hump in the curve throws off the accuracy.
But ideally, i would have to break it up into 2 pieces like red. that way it'll cover the area like as if every point is stretched.
Is there a way to determine where these points are...and is it possible to add these points onto existing path like inserting them there?

I'm happy with the straight perspective points, for which I was seeking a script for. If there is a fix to curved points, I'll gladly update the plugin.

In the absolute case it is easy to add a point. See "De Casteljau's algorithm" on Wiikipedia. Don't get impressed by the math, see the geometric interpretation, and milk the sentence "Note that the intermediate points that were constructed are in fact the control points for two new Bézier curves"

However for your script you have first to find where these points will be, so you want to find the tangent between two Bezier curves, and since in the general case these tangents will not be between corresponding segments, of the two paths, you'll have to find an algorithm to determine which segments... Not trivial. There may be a research paper on the subject somewhere.

Thanks ofnuts.
I was hoping it was easy.

It is easy with a pencil and tracing paper... hahaha

More exactly, the easy cases can be done with pencil and tracing paper

that's not fair because with a ruler on paper, when searching for similar tangent points you're doing parallel search as you move the ruler across the paper.

Let's see how many tangents you find...

Do the invisible tangents count?