实现录制视频功能鸿蒙示例代码

   // 向会话中添加录像输出流
    try {
      this.captureSession.addOutput(this.videoOutput);
    } catch (error) {
      let err = error as BusinessError;
      console.error(`Failed to add videoOutput. error: ${JSON.stringify(err)}`);
    }

    // 提交会话配置
    try {
      await this.captureSession.commitConfig();
    } catch (error) {
      let err = error as BusinessError;
      console.error(`captureSession commitConfig error: ${JSON.stringify(err)}`);
    }

    // 启动会话
    try {
      await this.captureSession.start();
    } catch (error) {
      let err = error as BusinessError;
      console.error(`captureSession start error: ${JSON.stringify(err)}`);
    }

    // 启动录像输出流
    this.videoOutput.start((err: BusinessError) => {
      if (err) {
        console.error(`Failed to start the video output. error: ${JSON.stringify(err)}`);
        return;
      }
      console.log('Callback invoked to indicate the video output start success.');
    });
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 async startRecord() {
    if (this.avRecorder) {
      // 开始录像
      try {
        await this.avRecorder.start();
      } catch (error) {
        let err = error as BusinessError;
        console.error(`avRecorder start error: ${JSON.stringify(err)}`);
      }
    }
  }
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