First of all I'll share my experience, but there is no official info about this topic.
In my opinion - yes, standing in a one place blocks floor resets. If floor reset is blocked no boss will appear. I could notice it when one girl long time ago was camping Ocyakao from 10 AM to 1 AM. She never killed it, while I was checking it when she was offline and easily killed Ocyakao several times. You can say that it is coincidence, but I noticed the same thing with many other bosses. If someone is camping on their spot, he usually doesn't meet the boss. Bosses used to appear when nobody is near. When place is empty for a while.
It also doesn't matter if you're standing on level 0 or +1. You block floor reset in both cases.
Of course there are some situations that seems to be exceptions, but in fact it's not. For example I was standing there for 10 minutes and suddenly boss appeard - it was possible, because floor reset already happened (maybe 1 hour before).
Another exception is the last day when boss may appear - during last day boss rather MUST appear so floor resets are not so important.
Last thing, which for me is very important is to think, if it's really nice to camping bosses (generally), because in my opinion it is very rude to other players. We are not the only on the server, who want to meet some bosses. We should act fair. People used to camp bosses because of selfish reasons. They want an item, so they will disturb everybody. As a result, they won't kill the boss because they were blocking the respawn, but other people won't kill it neither, because boss will appear for example at night when nobody checks it (in case of Ocyakao it probably won't happen, it is the most wanted boss).