Creating BezierPath from Texture in SpriteKit/Swift

Question

So, basically, I have a sprite (.png) in SpriteKit, where most of the pixels are zero/no detail etc.

I wish to create a UIBezierPath of only the detail inside the Sprite, so later I can use containsPoint.

After a bunch of googling I found you can create a PhysicsBody using the path of the Texture in the sprite image, like this:

    let texture = SKTexture(imageNamed: "myImage.png")
    img.physicsBody = SKPhysicsBody(texture: texture, size: img.size)

This creates a physics body around only the detail inside the image, excluding any alpha value pixels, if you know what I mean.

Is there a way to create a BezierPath doing the same? or maybe creating a CGPath, then using that to create a BezierPath?

The reason is, I'm hoping to test if a CGPoint is inside this sprite, without using the physicsDelegate or physicsBodys.

Thanks in advance.