Do you live in the United States? If you do then you can download them again for free - as long as the movies are available for free downloads. Apple has not forged agreements with every movie studio yet so you just have to check.
Launch iTunes, and tap on the purchased tab. In the upper left corner you will see a "View" button. Tap that in order to toggle among music, TV Shows and Movies. Select Movies and then see if the movies appear. If they do, tap the Movie icon and then tap the cloud icon next to the icon in order to begin the download.
You have to use the same Apple ID that you used to purchase them.
If you do not live in the U.S. then you will have to purchase them again.
Besides, I do like to share you another tutorial
recovery deleted video from iPad 2, hope it can help you.
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