What exactly is happening?

You can create specific ad variations, one of which is a video advert. Just look on the very first options

make a different account then apply for a AD

You might have encountered a bug there. Have you tried client support?

Yeah would love to see more information rather than just I am getting this.

If you write what exactly is happening, then some one can help. There is wide range of errors and possible solutions. But please mention your error specifically.

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create another new account and try to manage in that..that would help...

i think there will be some problem with your account..so try create a new account and then try..