HOW TO DOWNLOAD VIDEO FROM YOUTUBE WITHOUT ANY SOFTWARE

Tricks 1:
Go to the following link

http://en.savefrom.net

paste your youtube video link

and choose format and click download
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Tricks 2:

1) Go to www.youtube.com. Open the page of the video you want to download.

2) Add "ss" between the www. and the youtube.com section of the URL and hit enter. 

Example:

Original YouTube URL:  http://www.youtube.com/

Modified YouTube URL: http://www.ssyoutube.com/

3) This will redrect your browser to another site SaveFrom.net:

4) Choose the format of the video. Click on the link of the format . 
  
5) And your download will start in your downloader.