Youtube having large collections of videos in different categories.Youtube has millions of videos and every minute 78 hours of new videos uploaded in Youtube. Youtube last year rolled out 3D videos feature. So user can watch 3D videos from youtube with help of HTML5. Your computer monitor should support 3D vision and your web browser supports to HTML5 to watch 3D youtube videos on Youtube.
How to watch 3D videos on Youtube:
First go to youtube and type 3d videos in youtube search bar hit enter. Some videos listed in your search result. In that videos you can see the small icon as 3D like below image.
If you see the above circled icons you confirm that video available in 3D format. just click the video and watch it on your 3D supported monitor in youtube.