I would recommend to use OpenCV for this kind of application.
We do not have a sample ready-to-use for this kind of application.
However, we have a sample called “Camera control” that does this for one camera (https://github.com/stereolabs/zed-sdk/tree/master/camera%20control/cpp). You can start from there and adapt it to handle multiple cameras.
We do not provide custom code, however do not hesitate to ask if you have specific questions.