Open camera on a dirty scheduler (#25)

* Open camera on dirty scheduler

* Apply reviewr suggestion

Author: FelonEkonom

README.md

@@ -13,7 +13,7 @@ It is part of [Membrane Multimedia Framework](https://membraneframework.org).
 Add the following line to your `deps` in `mix.exs`. Run `mix deps.get`.
 
 ```elixir
-	{:membrane_camera_capture_plugin, "~> 0.7.4"}
+	{:membrane_camera_capture_plugin, "~> 0.7.5"}
 ```
 
 This package depends on the [ffmpeg](https://www.ffmpeg.org) libraries. The precompiled builds will be pulled and linked automatically. However, should there be any problems, consider installing it manually.

c_src/membrane_camera_capture_plugin/camera_capture.spec.exs

@@ -8,4 +8,4 @@ spec do_open(url :: string, framerate :: string) ::
 spec read_packet(state) :: {:ok :: label, payload} | {:error :: label, reason :: atom}
 spec stream_props(state) :: {:ok :: label, width :: int, height :: int, pixel_format :: string}
 
-dirty :cpu, read_packet: 1
+dirty :io, read_packet: 1, do_open: 2

mix.exs

@@ -1,7 +1,7 @@
 defmodule Membrane.CameraCapture.Mixfile do
   use Mix.Project
 
-  @version "0.7.4"
+  @version "0.7.5"
   @github_url "https://github.com/membraneframework/membrane_camera_capture_plugin"
 
   def project do