The Ursids is a minor meteor shower producing about 5-10 meteors per hour. It is produced by dust grains left behind by comet Tuttle, which was first discovered in 1790. The shower runs annually from December 17-25. It peaks this year on the the night of the 21st and morning of the 22nd. This year the glare from the full moon will hide all but the brightest meteors. If you are extremely patient, you might still be able to catch a few good ones. Best viewing will be just after midnight from a dark location far away from city lights. Meteors will radiate from the constellation Ursa Minor, but can appear anywhere in the sky.
Did you added your own Google API key? Look at the help.
Check in YouTube if the id PLvHmlgi4ypd2JAX_ejexOhk9Ma98Whi5J belongs to a playlist. Check the FAQ of the plugin or send error messages to support.