HunyuanVideoPieeline can't run on multi-GPU

### Describe the bug

With the code provided in the doc, HunyuanVideoPipeline raises "Expected all tensors to be on the same device" error on multi-GPU platform.

### Reproduction

With the code provided in the doc, HunyuanVideoPipeline raises "Expected all tensors to be on the same device" error on multi-GPU platform.

### Logs

```shell

```

### System Info

8*A100

### Who can help?

_No response_

Start with the documented HunyuanVideoPipeline example and reproduce the reported device mismatch on the stated 8×A100 multi-GPU setup. Trace where tensors are placed across devices; done means the documented pipeline runs without the “Expected all tensors to be on the same device” error.

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