crop

I have done some research on something I'm trying to do, I have a face-cam type of thing on some of my gta videos and it's my character instead of my face, anyway I have been trying to shrink that picture as far down as possible while still having an image that's not going to be so small it's...

This is my first Photoshop tutorial. Goals: Change the background, change the hairstyle, change the color of the shirt, add sunglasses over the face.

So I REALLY NEED an app that can crop videos on Android, there are some on the play store but there all b.s or take too long to crop the video. OR an app that allows you to take off a watermark from a video. I didnt mind the watermark but it takes up more screen than id like it too. Please help!