No, QuickTime does not burn video DVDs. You can either use Burn or Toast Titanium for that.
QuickTime is for playing back video and audio files.
Also have a look at the following links, as the information presented there might be helpful in your future endeavours into Mac OS X and could clear up initial confusion and may even prevent harm to your system or your files.
Mac OS X Basics
Switch 101 - guide with articles made by Apple on how to accustom yourself, after you switched to Mac OS X from Windows