how to ask permission?

As others have said, just contact them and ask! Be polite of course, and as a courteous if they don't ask for it, I would put a link in your description where viewers can buy/watch/whatever the product. For example, for a certain game that didn't explicitly say monetization is alright with them in a FAQ or anywhere on their website, I sent the community manager an e-mail. They were very kind and gave me explicit permission to create an LP of their game. It's really as simple as that!

Note that, however, not all companies will allow this. It is best to respect their decision and leave it at that, as they do own the rights to everything about the product.

Hope that helps.
 
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