I accidentaly found the site: animoto.com.
It's a site where we can make our own video trailer. It's a short one though, only 30 seconds. But, this only for free account. If you want more time then you have to pay money (obviously XD).
The 30 seconds also depend on the song we used. The faster the song, the faster the video will be.
I've tried it and I'll say it's quite satisfying!! (XD).
This is the video I've made. It still celebrating Umi-nii birthday! (XD)
Hope people enjoy it as I surely do!