I am wondering whether it is possible to limit the possibility to vote in a poll to certain groups. Should that not be the case, I figure it would be easy to add that functionality, would it not?
Sure, create a category, give only that group permission, create a poll in that category 
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I specifically asked about the right to vote instead of access, because some processes should be transparent but taking part in them should be limited. Sorry for not clarifying earlier.
Do reply permissions include those for votes? Then disabling those in the categories in question is not nice, but it could work.
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Para finalizar este assunto, isso é possível há algum tempo. 
Você pode escolher quais grupos podem participar de cada enquete usando a opção Limitar votação a estes grupos na seção avançada:
Você pode votar nesta enquete?
- Sim
- Não…
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voters