Hello @Prathiksha,
I have received a solution to original question, sorry for the late reply. Please follow these steps:
- Open S32DS 3.2, click on Help, then on Install New Software...

- In the new window, select the S32 DS update site:

- This will give you an error, this is expected, now change the link from http://www.nxp.com/lgfiles/updates/Eclipse/S32DS_3.2 to https://www.nxp.com/lgfiles/updates/Eclipse/S32DS_3.2 (not the added s: in https). Now you will se the Vision Extension package:

I was able to install the package successfully following this steps, please let me know if you are able to follow them as well.
Thanks.