What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You can add an upload button to let a user upload a video of themselves.
Then add the list of common video formats in the Extensions field.
mpeg, mpg, mpe, avi, mov, qt, wmv, rm, mp4, 3gp, mkv, flv
You may also need to increase the upload size limit. Here's a guide that can help: Changing the Upload Size Limit.
Furthermore, please note that you might need to have a paid account, as free accounts only allow a total upload space of 100 MB.
Or if you want users to submit a youtube link, you can simply add a regular textbox field.
Do let us know if you need further assistance.