Believe it or not some people are not comfortable recording a video on their mobile device and uploading the video to YouTube especially if you have an older target market. One way to ease the submission process is to record a video explaining how to upload a video into your contest platform.
There is plenty of software out there that can easily record your screen, showing how to upload a video to the contest. This will ultimate save the headache of having to work with your entrants to get them to submit videos into your platform. Make sure to post your instructional video at least a week before your contest and throughout your submission date range.
Happy Contesting!