Nasal semivowels/fricatives?

The interesting h-debate (I'd dare bet alot that I'm the only 15-year old
that finds it interesting), that probably everybody has noticed, made me
wonder - if approximants *are* more or less vowels, then they should have
the ability to be nasal, wouldn't they?

According to the same debate, fricatives / approximants are very close to
each others, articulatorily, so the same should be possible for fricatives,
wouldn't it?

My question basically can be put like this: 1) is this actually possible, 2)
are there languages using this 3) can I have a nasal affricate in my lingo,
mommy?

 -- M i e k k o