This method is used to start the flow of data from the inputs to the outputs connected to the AVCaptureSession instance that is the receiver. This method is synchronous and blocks until the receiver has either completely started running or failed to start running. If an error occurs during this process and the receiver fails to start running, you receive an AVCaptureSessionRuntimeError.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.