update zh-cn/application-dev/media/video-recording.md.

Signed-off-by: Nshuboxu <xushubo1@huawei.com>

zh-cn/application-dev/media/video-recording.md

@@ -103,9 +103,9 @@ AVRecorder详细的API说明请参考[AVRecorder API参考](../reference/apis/js
      输入源模块通过SurfaceID可以获取到Surface，通过Surface可以将视频数据流传递给AVRecorder，由AVRecorder再进行视频数据的处理。
      
    ```ts
-   avRecorder.getInputSurface().then((surfaceId) => {
+   avRecorder.getInputSurface().then((surfaceId: string) => {
      console.info('avRecorder getInputSurface success')
-   }, (error) => {
+   }, (error: Error) => {
      console.error('avRecorder getInputSurface failed')
    })
    ```