No, Proclaim does not support DVD playback at this time.
If you have a DVD you'd like to play, you'll need to use a tool like Handbrake to rip the section of the DVD you'd like to present. Then, you can upload the video file to your group, or you can add it for local use.
When you don't have time to rip the file to your computer, the quickest way to show your DVD is to open it in a separate program on On Air window. Minimize it, then maximize when it comes time to present. Leave a stage direction in the order of service so the operator knows when to switch programs.