Am3 motherboard with 2x hdmi?

Also, if I got one could I play a movie on my tv while using the computer on my monitor

Hi newcomer and welcome to the Tom's hardware forum.

1- Since u want Crossfire, u don't need a mobo with HDMI onboard, the GPU comes with this.
2- I'm not sure, but I think that it's possible. It's something called "extended monitor"

The gpu will have 2?

Or mobo 1 + gpu 1

1- For the Crossfire, every GPU have one HDMI port, like a Crossfire is two or more GPUs, u have the 2xHDMI that u want.
2- That's another option, buy a mobo with video onboard and HDMI port, one of the mobo + one of the GPU. But IMO the mobos with video onboard aren't good for gaming rigs.