AGMCapturer not compatible with agora sdk version >= 4.0.0

[NinhNM]

My project have use feature face unity with agora version 3.7.x.
But when update agora to version 4.2.0 have error occur.
Because version 4.2.x remove AgoraVideoSourceProtocol so now I dont't use class CapturerManager.
Can you tell me how to fix it?