two textures on one 3d model. is it possible?

Hello everyone! Created a situation where I need to use a smooth transition between two textures on the one model, that is, to impose both an alpha channel and adjust each, tell me how to implement such a miracle)

In general yes it is possible.
I have done it many times (with as many as 6 or more textures) blending using a custom HLSL shader.
There is more than one way to skin this cat, depending on your models geometry and vertex format etc…
You can do it using multiple texture coordinates, or masking textures. This kind of thing is done all the time, all depends on your specific needs and geometry/vertex format.