@FayFen No, or if there is I've never found it. A users posts can be found in their profile. Not sure if that's available to non moderators. It is I've just checked by signing out.
... is there statistics how many users on the video forum
I'm not sure that a statistic showing how many are logged in to the forum will any way truly represent how may are actively involved in reading/contributing to the forum at any point in time. I suspect that most regular forum users are like me and don't log out at the end of closing their forum session. So even if fast asleep, out shopping, working at an unrelated job, that forum member would still be 'logged in' to the forum but not 'active' on the forum.
I guess I was lost in translation, by "on" I didn't mean "logged right now"... but how many register and how they rate with there massage count. who are the top 50? and location?
Maybe it's a matter of the platform the forums sits on that doesn't want anyone to know.
As @EricLNZ mentioned above, you'd see users' post and comment counts in their profile. Start with a user (from 'Big Smoke') who has (so far) 2316 forum posts and 24174 comments since early 2002. A long-time (Stateside) user has a message count well over 25K. The rest of the top 50 you need to work out yourself though.