Q: how to upload movies or tv shows videos from my windows PC to new ipad

Sync it with iTunes.  If the formats are not iTunes compatible you will have to convert them.

iTunes: May be unable to transfer videos to iPhone, iPad, or iPod - http://support.apple.com/kb/TS1497 - incompatible format for devices.

iTunes: Syncing media content to iOS devices and iPod

It basically works like this.

Connect the iPad to the PC and launch iTunes.

Click on the iPad name on the left side under devices.

Click on the Movies Tab on the right.

Click on all of the movies that you want to sync

Click on the Sync Movies Heading.

Click on Apply in the lower right corner of iTunes

To trasnfer movies, videos and other files to your new iPad from your computer, can use iTunes which allow you to trasnfer files from your computer to iPad and vice versa. But in case if you fails to iTunes to trasnfer your videos to your iPad then you can use an advanced iPad file trasnfer application which helps you to trasnfer your files to the ipad from your Windows or mac PC.

Follw these below steps to trasnfer your files to your iPad:

• Download and Install the hthird party iPad file trasnfer software.
• Connect your iOS device to your computer.
• Select the that you want to transfer.
• Now transfer your files to computer or other devices easily.

For more information visit: http://www.howtobackupipad.com

Source: http://support.apple.com/kb/ht1386