Is there a way to paint tessellation or displacement textures on a terrain?

Hi,
I’ve tried looking around the web for a way to paint displacement textures or ‘tessellation’ on a terrain. This is what i am aiming for:

I’ve seen tutorials that use the direct x 11 shaders, but i can’t the option to enable it. I would like to know how to add a texture that i can paint on the terrain, which will edit the terrain’s vertices.

You need not a tesseleation or parallax texture, but tesselation or parallax shader. I do not really know any of these shaders available for free, but there are some tesselation and parallax terrain shaders for around 15 dollars inside asset store.
For example, the shader I am using has a tool which combines diffuse and height map to get the displacement. Usually, shaders will use alpha channel for the height map. You can add it using programs like GIMP or choose alpha from grayscale when you select your texture inside the editor.