Main Menu Animation Effects?

Hi guys,

I was wondering if it's possible to have an animated main menu screen using a GIF from photoshop, or something exported with the sprite sheets in some way. I'm an artist working in a group to make a game in my 1st year class at uni. I have designed a menu screen in photoshop with a castle and a flag. My team mates and I were wondering if I'd be able to make a gif in photoshop and export the sprite sheet (or something like that, I'm really new to this so apologies if I sound stupid) to be implemented as a main menu screen so that our flag looks like it's moving while on the main menu. I'm sure it must be possible in some way to animate it, but none of us have any clue how!

If anyone would be able to give me some advice here, I'd really appreciate it.