And a minimalist summary of what to cover...
para 1 Intro: which of your projects are you going to write about? briefly describe it
para 2: what are some of the key features of the concept you are being asked to apply? maybe outline two of the theories/ideas of particular writers briefly
para 3; start to apply the concept, making close reference to your production to show how the concept is evident in it
para 4: try to show ways in which ideas work in relation to your production and also ways in which those ideas might not apply/could be challenged
para 5; conclusion
Again remember you only have 30 minutes and that you really need to analyse the finished production, rather than tell the marker how you made it