Basic Video Editor using Open Source libraries (for QT IDE)

Hello, I require an experienced developer having experience with multimedia libraries such ffmpeg, libav, ... He will be required to create a simple and easy-to-use QT GUI for basic video edition, Please, specify which libraries you will be required to use in order to achieve the goal. Only candidates making accurate questions and giving accurate description about how he will manage the development will be considered. Thanks and Best Regards, David