All videos embedded from YouTube - click to video and you will see YouTube LOGO and link to YouTube page
If you have found your video on Wellvideo and this video from YouTube or other video-services — just disable embedding option on YouTube (you can do it in your account's settings on Youtube) and your video will be automatically deleted from wellvideo.
But you must know!
All views of videos on wellvideo are fixed (and showed) on YouTube (and other). And the owner of the video on YouTube does not lose views and clicks on ads.