support to show local video when chatting

docs/index.md

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+<h1 style='text-align: center; margin-bottom: 1rem; color: white;'> Gradio WebRTC ⚡️ </h1>
+
+<div style="display: flex; flex-direction: row; justify-content: center">
+<img style="display: block; padding-right: 5px; height: 20px;" alt="Static Badge" src="https://img.shields.io/pypi/v/gradio_webrtc"> 
+<a href="https://github.com/freddyaboulton/gradio-webrtc" target="_blank"><img alt="Static Badge" src="https://img.shields.io/badge/github-white?logo=github&logoColor=black"></a>
+</div>
+
+<h3 style='text-align: center'>
+Stream video and audio in real time with Gradio using WebRTC. 
+</h3>
+
+## Installation
+
+```bash
+pip install gradio_webrtc
+```
+
+to use built-in pause detection (see [ReplyOnPause](/user-guide/#reply-on-pause)), install the `vad` extra:
+
+```bash
+pip install gradio_webrtc[vad]
+```
+
+For stop word detection (see [ReplyOnStopWords](/user-guide/#reply-on-stopwords)), install the `stopword` extra:
+```bash
+pip install gradio_webrtc[stopword]
+```
+
+## Examples
+See the [cookbook](/cookbook)