How can I disable or enable camera ?

[TaoufikBouabid]

I am going to add some features to your app, but I can't enable/disable camera
I'm trying the following to disable :
let factory = PeerConnectionFactory.sharedInstance.factory
if let stream = factory.mediaStream(withLabel: "ARDAMS") {
stream.removeVideoTrack(PeerConnectionFactory.sharedInstance.createLocalVideoTrack())
}

and to enable it :
let factory = PeerConnectionFactory.sharedInstance.factory
if let stream = factory.mediaStream(withLabel: "ARDAMS") {
stream.addVideoTrack(PeerConnectionFactory.sharedInstance.createLocalVideoTrack())
}

but without solution?