Making film and taking photograph is unlawful. It is mentioned in Hadith:
اشد الناس عذابا المصورون
(On the Day of Judgment, picture-makers will be given the severest punishment.
Whether it is made from camera or mobile, whether in a party or not, whether of mixed gathering or not, all carry the same ruling. Making films of men and women separately is also unlawful and haram, while making the film of men and women together is more sinful.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband