I do the tracking in Mocha pro like it shows in the images (hope you can se them) but my layer never fit on the screen. what do I miss. Do I need to use the grid maybe?
This usually means there’s a timing mismatch somewhere.
Was the solid the same size as the comp? Is your layer time-stretched?
Well in Pr I changed the resolution from 1920x1080 to 1920x803 for 21:9 aspect ratio then I replace my video with after effects for tracking and compositing.
Have you aligned your surface tool in Mocha to the place you need your corner pin? It’s very likely that you have not, that looks like a nice, square surface tool that never got set to the plane.
Try that and let us know? The corner pin always mirrors the surface tool in Mocha.