Yes thank you so much rlmonera, that perfectly works in clearing out iOS video streaming data. Actually it's easier than skipping to the end of the movie.
Method 1: When you stream a movie from the Video app with iCloud, the movie begins playing over your wifi network and downloads to the device at the same time. If you are able to finish the movie without interruption, the movie will be added to your usage summary under General, Usage, Videos in the Settings app, and you can delete it from there.
Method 2: However, if the movie freezes like when your wifi disappears, or if you don't watch the full thing, you can't delete the cache data in Settings. To delete the cache, close the Video app by double clicking the Home Button, then swipe up to close the app. Next, go back to the very same movie and start streaming it again. Once the movie starts playing where it left off, swipe the progress to the beginning of the movie timeline. This deletes the cache and starts downloading the movie again. After the first few seconds, stop playing the movie and close the Videos app again. Then if you go back to your usage settings, the space the movie used will be freed up.