Can we upload videos?

Yes, you can create upload forms, so your users can upload any type of file. Please check the following guide: https://www.jotform.com/help/332-How-to-Create-File-Upload-Forms 

If you are actually looking to show a video in your form, you can use the Youtube widget: https://widgets.jotform.com/widget/youtube 

https://www.jotform.com/help/252-How-to-Add-a-Widget-to-Your-Form 

Let us know if you need more help.