Video merging 2 screens into 1

I had a recording with a singer / presenter at outset studios manchester. Once recording emailed to me . I notice that my self and the singer are on 2 seperate screens. Im looking to have these 2 screens merged together so my self and the singer are on 1 screen.
Any help will be much appreciated. Not sure if can upload videos on here but if have an email can send what the studio sent to me. Any help would be much appreciated
Thank you.