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This question is more device specific.

Every PTZ camera has its own way of handling controls (some use custom API with socket programming in C++, some could be controlled by requests over HTTP).

You will need to customize this appropriate to your application. AFAIK there is no single API that is common for all PTZ cameras.

Look into the developer manual for that specific manufacturer and model number. Looks like they have an SDK and you could use it with your Visual C++ code.