Has the younger brother's earnings from his work in editing and preparing DVDs for corporate and wedding videos become lawful? And is it permissible for the older brother to open a video rental store?

Video recording can be permissible, such as recording mountains and trees, and it can be forbidden, such as recording women, mixed weddings, or music videos. At weddings, the wife is in her full adornment, as are the female guests, and it is forbidden for non-mahram (definition) men to look at them, whether directly or through pictures or films. Mixing, dancing, and music at weddings are forbidden. It is not permissible to record wedding parties that contain these forbidden acts, nor to sell, buy, or rent such materials. It is forbidden to set up a platform for the bride where her husband sits with unveiled women present, due to the corruption and temptation it entails. A Muslim must abandon work involving the production or circulation of forbidden things and seek lawful employment.