视频组件Video如何加载设备沙箱环境下的视频文件？

@Component
export struct VideoPlayer{
  private controller:VideoController | undefined;
  private previewUris: Resource = $r ('app.media.aa');
  private videoSrc: string = 'file:///data/storage/el2/base/haps/entry/files/show.mp4'
  build(){
    Column() {
      Video({
        src: this.videoSrc,
        previewUri: this.previewUris,
        controller: this.controller
      })
    }
  }
}