Is it possible to use two graphics cards for CUDA?

Question

GPGPU

Or, let's say the integrated video card is used for video, and the second for CUDA

Answer 1

Read the manual already.
It doesn't matter what video card you use. You won't be able to download it 100% at first. And so - you have the opportunity to programmatically send the execution to any device available to you. It is also possible to execute the code simultaneously on two videos, but only in manual mode. That is, you yourself must write the code that launches the application on different cards.
Once again. Read the manual. There, at the beginning, an overview of the architecture, etc.