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To use the `gorgonia/cu` package, you can import it and use its functions to perform CUDA operations. Here's an example of how you can modify the previous code to use `gorgonia/cu`:

```
package main

import (
	"log"

	"(link unavailable)"
	"(link unavailable)"
)

const (
	srcFile = "/path/to/source/video.mp4"
	dstFile = "/media/usb/video.mp4"
	bufSize = 1024 * 1024 * 16
)

func main() {
	// Initialize CUDA
	device, err := cuda.GetDevice(0)
	if err != nil {
		log.Fatal(err)
	}
	ctx, err := device.CreateContext(cudart.ctxSchedAuto)
	if err != nil {
		log.Fatal(err)
	}
	defer ctx.Destroy()

	// Open source file
	src, err := os.Open(srcFile)
	if err != nil {
		log.Fatal(err)
	}
	defer src.Close()

	// Open destination file
	dst, err := os.Create(dstFile)
	if err != nil {
		log.Fatal(err)
	}
	defer dst.Close()

	// Allocate memory on the GPU
	srcBuf, err := cu.Malloc(bufSize)
	if err != nil {
		log.Fatal(err)
	}
	defer srcBuf.Free()

	dstBuf, err := cu.Malloc(bufSize)
	if err != nil {
		log.Fatal(err)
	}
	defer dstBuf.Free()

	// Copy data from source file to GPU (using GPU)
	buf := make([]byte, bufSize)
	for {
		n, err := src.Read(buf)
		if err != nil {
			if err != io.EOF {
				log.Fatal(err)
			}
			break
		}
		if err := cu.MemcpyHtoD(srcBuf, cu.DevicePtr(buf), uint(n)); err != nil {
			log.Fatal(err)
		}

		// Copy data from GPU to destination file (using GPU)
		if err := cu.MemcpyDtoH(cu.DevicePtr(buf), srcBuf, uint(n)); err != nil {
			log.Fatal(err)
		}
		if _, err := dst.Write(buf[:n]); err != nil {
			log.Fatal(err)
		}
	}

	log.Println("File copied successfully!")
}
```

Note that you need to replace `"/path/to/source/video.mp4"` and `"/media/usb/video.mp4"` with the actual file paths you want to use for copying.

Also, make sure to install the `gorgonia/cu` package and its dependencies before running this code. You can do this by running the following command in your terminal:

```
shell
go get (link unavailable)
```

This code uses the `gorgonia/cu` package to perform CUDA operations, such as memory allocation and data transfer between the host and device. The `cu.MemcpyHtoD` and `cu.MemcpyDtoH` functions are used to transfer data between the host and device, and the `cu.DevicePtr` function is used to get a device pointer for the buffer.