refactor: basic example from class component to functional component (#3934)

* refactor: basic example from class component to functional component

* refactor: toast component path

* refactor: bufferConfig prop

* refacotr: import component path

* fix: seekbar issue on iOS

examples/basic/src/VideoPlayer.windows.tsx

@@ -108,7 +108,7 @@ class VideoPlayer extends Component {
             this.setState({paused: !this.state.paused});
           }}>
           <Video
-            source={require('./broadchurch.mp4')}
+            source={require('./assets/videos/broadchurch.mp4')}
             style={styles.fullScreen}
             rate={this.state.rate}
             paused={this.state.paused}