I’m on my lunch break flicking through the comments on different posts and I’ve noticed Cornish language TV and Radio come up a few times and if there is indeed any, well there is! 
BBC radio Cornwall has a weekly news bulletin on sundays called An Nowodhow
There is also An Radyo, which produces weekly (I think!) radio and TV programmes
They are all really useful for the learner, just to see how much you can pick up 
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I’ve just come across a new site, whilst not strictly tv it has a lot of videos and short films in Cornish and English about Cornwall
https://vimeo.com/showcase/tk