After declaring Panda3D's python as my interpreter, it unlinks all other libraries that I need

(I use Eclipse on mac but I can switch to any other tools that can solve this problem.)

Since I need to use the library Panda3D, the way to setup Panda3D showed on its official website is to make the compiler refer to a new python interpreter (ruable file) that Panda3D provides, which is a freshly new python.

So that although I can run Panda3D now, all the libraries that installed on my original python is unlinked. I get import error for that. Like import cv2 for OpenCV.

Can I reinstall the cv2 library on the Panda3D's python? The thing is I think I wasn't asked a specific path while I installed OpenCV, it just installed on a python path by default, with a lot of command line setup. I don't know reinstalling on specific path is possible.

I suppose it's also not possible to use (or merge) two python interpreters at the same time?

Or is there a easy way to just build the path to some OpenCV(or Panda3D) locations without installing it, despite that the working way to setup OpenCV is much more complex?