Hi Waghmare,

Use embed tag to play .avi video.

<embed src="Test.avi" type="video/x-msvideo" width="400" height="300"></embed>   

But it might not supported in all browser. So to play in all browser upload the video in youtube and set the scr property to play.

For playing you tube refer below article.

Different ways to embed and play YouTube video in HTML page