WordPress has introduced Videopress.com. This is a video sharing service provided by WordPress. Using this service, you can upload videos in different formats and use them into your blog.
However, you need to first upgrade your wordpress for videopress.com. Here is the way to do this:
1) Login to your wordpress.com account.
2) Go to Dashboard and you will find the upgrade button.
3) Click on the upgrade button and you will find the below mentioned options:
4) Upgrade for Videopress.com and enjoy the videos.