Eager to add and replace local camera data source interface

[liudehuaGithub]

Hello dear developers! I really hope you can open up a way to replace the local camera data source. Our application is connected to an external camera through Wi-Fi transmission. We want to use linphone-sdk to switch the data source arbitrarily during the video call between the two parties, so that the other party can see the picture of my external camera! In this way, linphone has taken another step towards the Internet of Things, and we are very much looking forward to this feature. thank you very much