Double check what hardware you actually have.
Intel graphics are integrated. If you don't have a dedicated GPU, that means that your CPU is also your iGPU.
If you're currently operating a desktop environment, then your graphics drivers are already installed and working.
If you didn't have a working iGPU or a GPU you would not be able to use a desktop environment.
Furthermore, unless you have a NVIDIA GPU, you have no use for NVIDIA graphics cards' drivers. In fact, if you forced the installation with incompatible hardware, you could very well break your system.
I don't know anything about your application, but it suggests to me that you may have set a wrong setting in that application. If you do not have a dedicated GPU and you are supposed to choose between CPU and GPU processing, you must probably select CPU.
After a quick search from my favorite search engine using the terms "DaVinci Resolve 17 minimum system requirements", it seems to suggest that a dedicated GPU is a requirement to run the software.