How to make player views statistics?

Question

Nginx

Hello everyone, I'm interested in the question about the implementation of statistics on player views, namely the counting of ads.
There is a movie site, it has its own database of films and its own VideoJS player, we noticed that other videos are taken from our site to their sites. The question arose to find out the statistics of views from this player and access to advertising (VAST) so that the statistics do not just count the play button, but it counts the view only when the advertisement works.
Please tell me which way to dig

Answer 1

Number of player downloads:

cat /var/log/nginx/access.log | grep VideoJS\.swf | wc -l