player.watermark is not a function

[grliao]

video.js: 7.2.10,
videojs-watermark: 2.0.0

The code snippets as follows:

import videojs from 'video.js';
import 'videojs-watermark';

.......
var player = videojs('my-video');
player.watermark();
player.src({
src: videoUrl,
type: 'video/mp4',
)};
........