let package = Package(
  ...
  dependencies: [
    .package(name: "LiveKit", url: "https://github.com/livekit/client-sdk-swift.git", .upToNextMajor("2.0.5")),
  ],
  targets: [
    .target(
      name: "MyApp",
      dependencies: ["LiveKit"]
    )
  ]
}

import LiveKit
import UIKit

class RoomViewController: UIViewController {

    lazy var room = Room(delegate: self)

    lazy var remoteVideoView: VideoView = {
        let videoView = VideoView()
        view.addSubview(videoView)
        // Additional initialization ...
        return videoView
    }()

    lazy var localVideoView: VideoView = {
        let videoView = VideoView()
        view.addSubview(videoView)
        // Additional initialization ...
        return videoView
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white

        let url = "ws://your_host"
        let token = "your_jwt_token"

        do {
            try await room.connect(url: url, token: token)
            // Connection successful...

            // Publishing camera & mic...
            try await room.localParticipant.setCamera(enabled: true)
            try await room.localParticipant.setMicrophone(enabled: true)
        } catch let error in {
            // Failed to connect
        }
    }
}

extension RoomViewController: RoomDelegate {

    func room(_: Room, participant _: LocalParticipant, didPublishTrack publication: LocalTrackPublication) {
        guard let track = publication?.track as? VideoTrack else { return }
        DispatchQueue.main.async {
            localVideoView.track = track
        }
    }

    func room(_: Room, participant _: RemoteParticipant, didSubscribeTrack publication: RemoteTrackPublication) {
        guard let track = publication?.track as? VideoTrack else { return }
        DispatchQueue.main.async {
            remoteVideoView.track = track
        }
    }
}

// 1. define a weak-reference set for all cells
private var allCells = NSHashTable<ParticipantCell>.weakObjects()

// in UICollectionViewDataSource...
public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ParticipantCell.reuseIdentifier, for: indexPath)

    if let cell = cell as? ParticipantCell {
        // 2. keep weak reference to the cell
        allCells.add(cell)

        // configure cell etc...
    }

    return cell
}

// 3. define a func to re-compute and update isEnabled property for cells that visibility changed
func reComputeVideoViewEnabled() {

    let visibleCells = collectionView.visibleCells.compactMap { $0 as? ParticipantCell }
    let offScreenCells = allCells.allObjects.filter { !visibleCells.contains($0) }

    for cell in visibleCells.filter({ !$0.videoView.isEnabled }) {
        print("enabling cell#\(cell.hashValue)")
        cell.videoView.isEnabled = true
    }

    for cell in offScreenCells.filter({ $0.videoView.isEnabled }) {
        print("disabling cell#\(cell.hashValue)")
        cell.videoView.isEnabled = false
    }
}

// 4. set a timer to invoke the func
self.timer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true, block: { [weak self] _ in
    self?.reComputeVideoViewEnabled()
})

// alternatively, you can call `reComputeVideoViewEnabled` whenever cell visibility changes (such as scrollViewDidScroll(_:)),
// but this will be harder to track all cases such as cell reload etc.