The video input is of a golf ball rolling through the camera (cant provide video links in this forum) I have seen the similar post. - https://developer.apple.com/forums/thread/652481?answerId=618320022#618320022 I've implemented it similar to the implementation in the wwdc20 'Action and Vision' app private lazy var detectTrajectoryRequest: VNDetectTrajectoriesRequest! =     VNDetectTrajectoriesRequest(frameAnalysisSpacing: .zero, trajectoryLength: 5) try visionHandler.perform([self.detectTrajectoryRequest])           if let results = self.detectTrajectoryRequest.results {             DispatchQueue.main.async { 							/* do stuff here */               self.processObservations(controller, results)             }           } I have not set a min or max size in order to get more results, the region of interest is set to just inside the camera (slight padding). I am on Xcode 12.0 beta 6, using an iphone XS on iOS 14 beta 6. Is there something wrong with my implementation? What can I do to improve this? thanks Also. the 'Action and Vision' example app doesnt work, so im unable to compare as there is not working example of DetectTrajectory