When students create a video on an iPad for assessment purposes there should be no issues when submitting this to your teacher.
Example A raw 2 minute video captured initially using your iPad camera.
File Size = 218Mb
Make sure you have access to the following Apps on your iPad.
Edit the video in iMovie
Export your movie back to the camera roll at HD 720p
At this stage you could upload your video to YouTube
File Size = 38.3Mb (16% of original size)
If you are using SEQTA, STREAM, TEAMS or OneDrive for your video submission, it is strongly recommended that you use the Compress App to reduce file size before submitting.