Game trailer and in app purchases

As i can’t find any info according to my question in FAQ, nor license agreement i will try to ask here.
If i bought some game assets with regular license, do i need another license to make a trailer for this game, post int on e.g YouTube, that includes those assets in the video ? And is it possible to implement in app purchases for things you can achieve by playing without spending any money? (e.g "unlock all levels for x$, or play one by one to unlock for free)