A Melbourne father is accused of threatening to kill a young man unless he married his teenage daughter, and then after the wedding having the groom pledge $450,000 as surety in case he fled.

A County Court jury was on Thursday shown footage from a 2015 wedding in which the groom in a black dinner suit smiled, hugged and kissed a bride wearing a yellow dress. The girl was at the time 15 and the man 22.

The video features footage of the couple smiling at the camera and at each other, and among the phrases interspersed are the lines "We'll be forever", "Life is wonderful" and "Feel your love".

But prosecutors allege that despite his smile, the groom was forced into marrying the girl, by the teenager's father, Majed Mamosi.