Add support v4l2 source

examples/go2rtc_mjpeg/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"github.com/AlexxIT/go2rtc/internal/api"
+	"github.com/AlexxIT/go2rtc/internal/app"
+	"github.com/AlexxIT/go2rtc/internal/mjpeg"
+	"github.com/AlexxIT/go2rtc/internal/streams"
+	"github.com/AlexxIT/go2rtc/internal/v4l2"
+	"github.com/AlexxIT/go2rtc/pkg/shell"
+)
+
+func main() {
+	app.Init()
+	streams.Init()
+
+	api.Init()
+	mjpeg.Init()
+	v4l2.Init()
+
+	shell.RunUntilSignal()
+}