First turn on Bluetooth, then go to the Photos Hub > Camera Roll, then press and hold the video you want to send, then tap share. The Bluetooth option is available
I believe pdf reader pro (paid app) by Pompolutz or Ocius can share pdf by Bluetooth.
Im not sure if there are other apps which can send pdf by Bluetooth.
but it is not possible with video folder, where i keep all videos other than camera captured....
if you are transferring videos from your computer, transfer them to the camera roll folder.