Well Media promotion is not just limited to Tv shows or movies I guess, there can be many things which can be used to do any promotions.
Sikh religion does have some rules and regulations which may create issues to promote the sikhism through different media mediums. There are many good comic books and story books for children as well as adults which teach them about the sikhism and the great history of Sikh gurus. You can take example of Probity Comics, they just started their own publication of Sikh comics and has launched 3 comics books (in english language) till now, you can know more about them on their website
Sikh Gurus Stories For children, Personalised Comics Books Gurus For Kids, Except them there are many other enterprenuers which are in the feild of creating sikh history books and other related comic books.
If we talk about the films then yes we may have some difficult issues but there are some really good films based on sikh culture, sikhism and sikh gurus like Rise of the Khalsa, Dhan Dhan Baba Deep Singh Ji, The Sahebzaday. so we can say that we are improving but on a very slow rate.