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C++ vs Python, the cost of the abstraction

Hello guys.

I'm working in a computer vision software for a while, and I always used C++ to code the system. The C++ was chosen because of performance. The software works with video input and have to normalize various aspects of a frame in each second and realize a classification for each frame (~ 30 classifications per second).

I was using Random Forests to classify these frames but now I'm migrating to Convolutional Neural Networks.

I always loved Python, and whenever I have to develop a external/personal project using opencv + machine learning I use Python, not C++. So I was thinking in begin this module (the CNN module) in Python instead of C++ (the rest of the system will still being written in C++).

My question is... A time ago I read that Python abstraction costs are much bigger that C++ abstraction's costs... How much? If I write a CNN that have to make at least 30 classifications per second, in python, it will be work? it will be slow? There's any text that lists the performance differences in a good quantitative way?

Thanks.