### Demo: Using pyscrcpy Client with callback and threaded loop

Source: https://github.com/yixinnb/pyscrcpy/blob/main/README.md

Shows two usage patterns for the pyscrcpy Client. demo1 uses a callback with on_frame to handle frames and touch input, while demo2 starts a threaded client and polls last_frame in a loop. Both require OpenCV (cv2) for display.

```python
import cv2 as cv
from pyscrcpy import Client # import scrcpy client


def on_frame(client, frame):
    client.control.touch(300,500)# emulate touch on(300,500)
    cv.imshow('Video', frame)
    cv.waitKey(1)


def demo1():
    client = Client(max_fps=1, max_size=900)
    client.on_frame(on_frame)
    client.start()

def demo2():
    client = Client(max_fps=20)
    client.start(threaded=True)  # create a new thread for scrcpy
    while 1:
        if client.last_frame is None:
            continue
        on_frame(client, client.last_frame)
```

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