Sorry for the delay.
I didn't mentioned it before but it's a windows service that uploades the videos/pictures to facebook.
You need a user with a "video_upload" permission for your application in order to use this code.
You can try this code:
FileInfo fileInfo = new FileInfo(videoPath);
FacebookService fbService = new FacebookService();
fbService.ApplicationKey = YOUR_API_KEY
fbService.Secret = YOUR_SECRET_KEY
fbService.uid = uid;
fbService.SessionKey = sessionKey;
fbService.API.video.upload("נסיון", "", fileInfo);
P.S The word - נסיון = "Test" in hebrew.