People Occlusion

Where do I need to add one of these lines of code in order to enable people occlusion in my scene?

config.frameSemantics.insert(.personSegmentationWithDepth)

static var personSegmentationWithDepth: ARConfiguration.FrameSemantics { get }

Here is the code:

import UIKit
import RealityKit
import ARKit

class ViewControllerBarock: UIViewController, ARSessionDelegate {

    @IBOutlet var arView: ARView!

    let qubeAnchor = try! Barock.loadQube()
    var imageAnchorToEntity: [ARImageAnchor: AnchorEntity] = [:]

    override func viewDidLoad() {
        super.viewDidLoad()
        arView.scene.addAnchor(qubeAnchor)
        arView.session.delegate = self
    }

    func session(_ session: ARSession, didAdd anchors: [ARAnchor]){
        anchors.compactMap { $0 as? ARImageAnchor }.forEach {
            let anchorEntity = AnchorEntity()
            let modelEntity = qubeAnchor.stehgreifWurfel!
            anchorEntity.addChild(modelEntity)
            arView.scene.addAnchor(anchorEntity)
            anchorEntity.transform.matrix = $0.transform
            imageAnchorToEntity[$0] = anchorEntity
        }
    }

    func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
        anchors.compactMap { $0 as? ARImageAnchor }.forEach {
            let anchorEntity = imageAnchorToEntity[$0]
            anchorEntity?.transform.matrix = $0.transform
        }
    }
}