On the page where you can download this sample project, we do mention that "Before you run the sample code project in Xcode, ensure you’re using an iOS device with an A12 chip or later."
https://developer.apple.com/documentation/vision/detecting_human_body_poses_in_3d_with_vision
You can always query the support compute devices for a given request with
https://developer.apple.com/documentation/vision/vnrequest/4284412-supportedcomputestagedevices
visionframeworkdev
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