Need help with live video processing in OpenCV in Python

I'm a cinematographer and I'm interested in matching cameras with through some regression algorithms, but I need a method of engineering lots of color RGB data samples. I'd like to write a program that can capture footage live from cameras through Blackmagic Capture cards and OpenCV, and grab RGB samples from a color chart continuously every 10 seconds. I'm beginner/intermediate in Python( I did write a script that can find the color chart in the image and pull the colors from it), but all of the documentation and examples for Blackmagic SDKs are in C++. I need some help to find out if I can even do this in Python and how to do it.