osxvideosink: start the loop before calling [gstview haveSuperview]
osxvideosink: start the loop before calling [gstview haveSuperview]

...as haveSuperview requires the mainloop to be running

knuesel/gst-plugins-good,knuesel/gst-plugins-good,knuesel/gst-plugins-good,knuesel/gst-plugins-good