Video codec constraints

New codelab: Realtime communication with WebRTC

# WebRTC samples Peer connection with codec constraints

## Video Codec Constraints

H264
VP8
VP9

View the console to see logging. The `MediaStream` object `localStream`, and the `RTCPeerConnection` objects `pc1` and `pc2` are in global scope, so you can inspect them in the console as well.

For more information about RTCPeerConnection, see Getting Started With WebRTC.

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