When working with YouTube videos in HTML you need to use an `<iframe>` to display the video. The `<object>` and `<embed>` tag combination only work with video that have not been encode through YouTube or are raw mp4, Adobe Flash, or ogg. 

 1. Rewrite the URL from `https://www.youtube.com/watch?v=lncOvjE4Fko` to `https://www.youtube.com/embed/lncOvjE4Fko`This will allow the video to be played in the popup. 
 2. If you want the video to start automatically when the page loads add `?autoplay=1` to the end of the URL.
 3. Replace the piece of code `<object width="425" height="355">...</object>` and put in the following: `<iframe id="ytplayer" type="text/html" width="640" height="390" src="**URL_GOES_HERE**" frameborder="0"></iframe>`The width and height can be change to be what ever works best for your size of popup. 

Now when you open the popup the `<iframe>` will load the video and you should either see the play button or if you added the  `?autoplay=1` parameter it will start playing automatically.