Video Greeting for a birthday?

Hi guys, this might sound like such as stupid issue and might sound childish but how does one go about making a very short video greeting if they hate cameras etc. Friend A (not as close, classmate in year 7) will have her 18th birthday soon and her friend, friend B (I'm quite close with her as I known her since year 3) has asked me to do a video greeting for friend A's 18th birthday. I'm not the kind of person to say no but I'm also quite shy. I'm not shy around my friends but I dislike taking photos and videos of myself, I'm a dude by the way. I just feel awkward taking photos of myself but don't mind when I'm in it with others. But since it has to be a personal greeting by myself, I dont know what to do. Help me please? Any advice from fellow introverts but not quite lol. Or just from someone who's not into photos and videos