The HP mod isn't all that common anyways and it's pretty useless. Sounds like a great idea that you can see each other's HPs, but then realise that the text is that big, it overlaps player's names anyways and makes it far more of a hindrance. You can check my past streams to see how big the text is.
And yes, you activate it with a press of a button, so a screenshot wouldn't be viable and recording is difficult because can cause performance issues if you've got a shit PC.