Ohhh that is tough but I am probably gonna agree with boy...it looks like there's a slight shadow between the legs, and there are no three lines....with my daughter the three lines were really bright.
also when they did the umbilical cord stuff the umbilical cord was going between the legs
Take a glance at my profile...I just uploaded some new ultrasound pics...one from my son's anatomy scan and one from my daughter's. They both had classical anatomical presentations so you can see what a girl is supposed to look like and a boy, if that'll help you when you look at your video :).