You asked it to do something with "the video on youtube" but what does "the video" refer to? It seems the most likely url associated with the phrase "the video on youtube" is, well, that.
So basically it failed at anaphora resolution.
Seen another way, you asked it for "the video" and so it gave you the video.
So basically it failed at anaphora resolution.
Seen another way, you asked it for "the video" and so it gave you the video.