GNU/Linux Parrot OS Installing NVIDIA GeForce RTX 4080 Driver Guide
How to Install NVIDIA GeForce RTX 4080 Graphics Driver in Parrot GNU/Linux desktop – Step by step Tutorial.
The NVIDIA GeForce RTX 4080 Driver Deepin Setup is a breeze, requiring just a few straightforward shell commands to complete.
Moreover, following the NVIDIA Recommendations is better to use the tested NVIDIA Linux Graphics Driver from the Deepin Repository.
Then with the nvidia-settings Tool you can configure Brightness, Gamma, XVideo attributes, Temperature, and OpenGL.
Especially relevant, prior to the Driver Setup you may consult:

GNU/Linux Parrot GeForce RTX 4080 Driver Installation Guide