The ZED SDK is designed to process depth information extracted from a ZED stereo camera device - i.e. the ZED 2 family, and the ZED X family.
The ZED X One in a monocular single camera configuration cannot provide depth information, so it is not supported "as-is" by the ZED SDK and by the applications based on it.
The ZED SDK supports two ZED X One in a calibrated dual-camera stereo configuration.
Additional details regarding the setup of this configuration can be found in the documentation.