I don't see any pink tummy, so my guess is that you have 2 males. This kind of exhibiting can be seen between male and female but at that point the female will have a very pink mid section. If you can see pink and it didn't come across on the video, you have a pair. If not, you may have trouble keeping one of them alive and happy. Hopefully you have a large 'foot' space in your tank, like 48". That way they can each set up territory and get out of each other's way.
Cathy