Sharing Content with Windows SDK

in API Overview, Section which documents how to send video or content is lacking sufficient information. It mentions

```c++
chime::VideoFrame* frame = /* generated video frame */;
local_preview->OnVideoFrameReceived(frame);
```

But this does not sufficiently explain:

1. How Meeting Session's Audio Video Member will use the Video Source passed to AddLocalVideo. How will the generated frames passed on to Chime Service. The Example of MyVideoSource seems to be missing important information.
2. What is the Format/Encoding etc. of Frame expected?
3. Since it is mentioned that Windows SDK already has a a pre-compiled WebRTC library, Can it be used to capture the screen as webrtc provides a built in feature to capture desktop with DesktopCapturer