Hey Aman,
I had a similar requirement a few days ago, and finally have found an extension for that!
It’s called Blur my shell, which gave the exact same look as shown in the reddit.
Find it here:
After updating the extension, PLEASE make sure to logout and re-login so that gnome-shell can reload the extension correctly. This is not a bug from Blur my Shell, but an unfortunate issue from gnome shell.
Like, this doesn’t give you a transparent look, but a translucent one 
Check here:
— Pranav Krishna (@TheProudLinuxer) November 4, 2021