How to catch the DOM change event of an element by an external library?

Question

Vue.js

https://vuejs.org/v2/guide/computed.html

<video ref="videoPlayer"
                       class='video-js vjs-big-play-centered'
                       :key="getCurrentPlayVideoUrl"
                >
   
                    <source :src="getCurrentPlayVideoUrl"
                            type="video/mp4"
                            v-model="this.currentVideoSource"
                    >
                </video>

export default {

        data() {
            return {
                currentVideoSource: '', // @todo - it is by default differs from  getCurrentPlayVideoUrl
                player: null,
            }
        },
 watch: {
            currentVideoSource: function (newQuestion, oldQuestion) {
                console.log(newQuestion);
                console.log(oldQuestion);
            }
        },

But when the link is changed by the player, watch is never called and currentVideoSource remains the same.
Is there any way to make it vue style without native ES listeners?