The Wedding Video (2012) on Netflix

Clumsy Raif Moyle returns to Cheshire for the wedding of his elder brother Tim to Saskia, their old school-friend, who was something of a wild child in the past. To the mild consternation of Saskia's socially-conscious mother Alex Raif proposes that, in addition to his duties as best man, he will make a video of events leading up to, and including, the wedding. This means he spends a lot of time with Saskia and begins to realize that, beneath the surface, the happy event may turn out to be less than happy for all concerned. Fortunately a wedding does eventually take place with surprises all round, the biggest one coming from Alex.