HarmonyOS 如何调用本地相册并选取视频？

可以参考如下demo：

import { BusinessError } from '@ohos.base';
import photoAccessHelper from '@ohos.file.photoAccessHelper';

@Entry
@Component
struct Photo_Access {
  build() {
    Button('访问手机相册').onClick(() => {
      try {
        let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions();
        PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.VIDEO_TYPE;
        PhotoSelectOptions.maxSelectNumber = 5;
        let photoPicker = new photoAccessHelper.PhotoViewPicker();
        photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult: photoAccessHelper.PhotoSelectResult) => {
          console.info('PhotoViewPicker.select successfully, PhotoSelectResult uri: ' +
          JSON.stringify(PhotoSelectResult));
        }).catch((err: BusinessError) => {
          console.error('PhotoViewPicker.select failed with err: ' + JSON.stringify(err));
        });
      } catch (error) {
        let err: BusinessError = error as BusinessError;
        console.error('PhotoViewPicker failed with err: ' + JSON.stringify(err));
      }
    })
  }
}