Error C000001D is an illegal declaration. The most common reason is binary corruption, such as a DLL, or in this case cv2.pyd.
There are several ways to damage it. You can have transferred or copied it as a text file, for example. Another common problem is the execution of a 64-bit code file on 32-bit hardware, or perhaps a 64-bit binary file with a 32-bit python, or any combination of the two.
You can also run code on a completely different set of commands or code file format, for example copy ARM code and expect it to run on Intel or Linux (ELF) under Windows (PE COFF).