Information processing device, information processing system, and method for controlling information processing device

An information processing system comprising:

• an imaging device capable of changing at least one parameter among pan, tilt, and zoom;
• a parameter controller that controls the at least one parameter of the imaging device;
• and
• a video processor that outputs a video stream by using a video captured by the imaging device,
• wherein the parameter controller instructs the imaging device to change the at least one parameter, and outputs a switching permission signal for permitting switching of the video stream output from the video processor to the video processor when the change of the at least one parameter of the imaging device is completed, and
• the video processor switches the video stream based on the switching permission signal.