You will need to import the video into iTunes on your computer and then sync to the iPad.
If the video is not in a format compatible with iPad you can also use iTunes to make a compatible version.
Adding music and other content to iTunes
There are lots of ways of moving files.
A simple and popular way to copy files and share files among your devices.
"Box lets you store all of your content online, so you can access, manage and share it from anywhere. Integrate Box with Google Apps and Salesforce and access Box on mobile devices" Rated the most secure cloud storage by SkyHigh Networks. You can buy a license to run box one of your servers.
Using iTunes to transfer files:
Files Connect -- "Cloud Storage services like Dropbox, MobileMe iDisk, Google Docs/Picasa, Facebook photos, FTP, SFTP, WebDAV ... AFS (Apple File Shares) SMB (Windows shares) protocols"
Windows File server
"The kiteworks mobile file sharing solution provides secure creation, viewing, and sharing of enterprise content on smartphones and tablets while providing IT and security teams the administrative controls to manage user privileges and access rights necessary to ensure enterprise security and compliance." " Includes choice of private cloud on-premise."
"Dukto is a simple application that allows you to share files between devices connected to the same (wireless) LAN network."
"Transfer files the easy way, just drag & drop the file and we will handle the rest. Like Apple AirDrop, but works and on all major platforms and computers that don't support AirDrop. Apps are available for iOS, OS X, Windows, and Android."
You could look into Apple's airdrop.
"To share content with AirDrop, both people need one of these devices using iOS 7 or later, or a Mac with OS X Yosemite"
Use AirDrop to wirelessly share content - Apple Support
How to transfer photographs