Is there a way to have clients upload a video? Will the file upload support videos?

Yes, there's a way to allow your visitors upload video files. You are in control of the accepted file types/extensions yourself. This and more were discussed in great detail on the guides I'm linking below.

Related guides:

How-to-Create-File-Upload-Forms

How-to-Change-the-Allowed-File-Types-in-the-Upload-Field

Give it a spin and let us know if you'd need more help.