Give search for home theatre door in houzz and it will give you a few ideas. But finally what you have to think or take help from interior designer is about the theme of your home as this door should also get aligned with your house theme. In general having hallway as part of home theatre is not advised so if you can change it, it would be better. But if you can't then at least install auto closure.

I can't able to understand location what your are saying and what your are expecting

Hello there, Since your requirement is of a living room , you would often want unobstructed views. Invisible grills or MS grills with simple horizontal designs would suffice. If you do want an elegant and classy look, go for black MS grills with patterns. As for doors , put a security grill in SS jaali with a double wooden door for safety and beauty as well. Regards, Aurum Ideas and Spaces Bhubaneswar

Hello, The window looks a little narrow but is placed in a really interesting place . You could go for creating a nice little bay window type here .for this you would need to create a sitting using wooden ply slightly uptil cill level and a foam seat mattress of the size. For dressing the window, roll up curtain could work the best here,I will attach some references.  Further if u wish to decorate it more in Roman style you could opt for a three side frame made around the window opening (On the wall) Shivani Chandra, Architecture Student Alittle