[Bug]: Cameras not responding in homekit
### What happened?

They show up as cameras in homekit but they don't stream at all. 

### Device Type

Doorbell (Supported)

### Plugin Version

v1.0.x (Supported)

### HomeBridge Version

v1.4.x (Supported)

### NodeJS Version

v12 (Supported)

### Operating System

Mac OS X 11+ (Supported)

### Relevant log output

```shell
[5/4/2022, 4:15:16 PM] [EufySecurity] Backyard FFmpeg process creation failed: spawn ffmpeg ENOENT
[Backyard] Snapshot request handler provided empty image buffer!
[5/4/2022, 4:15:18 PM] [EufySecurity] Doorbell FFmpeg process creation failed: spawn ffmpeg ENOENT
[Doorbell] Snapshot request handler provided empty image buffer!
```
