What are the best IP cameras to perform real-time video based OCR?

I am working on a problem where I need to read label number of a box when it is moving across to the camera. Currently, I am using an HIK VISION 4MP 12mm IP camera at 1/100s exposure. But the results are not accurate, I wanted to know that, the current camera is really sufficient for reading letters on label. Any camera recommendations are really helpful for my work.