Help with trackind head to add sunglasses

Hello,

So i’m new to mocha, and I would like to track an head to add sunglasses, the probleme is the tracking itself is good but when I apply to my sunglasses png, it moces weirdly when the head rotates.

Can any one help me ?

Thanks,

It looks like you need to track with perspective on, to me.

I actually tracked with perspective Idk why it does that

You probably have perspective keyframed off in the tracking keyframes. Having the shape stuck on doesn’t mean the track is, because you can keyframe the shape. You need to turn the surface tool on to see what the track is doing.