how about adding
IMAGE_INSTALL_append = "\
qtmultimedia \
qtmultimedia-plugins \
qtmultimedia-examples \
qtmultimedia-qmlplugins" to the local.conf, and add PACKAGECONFIG_append_pn-qtmultimedia = " gstreamer" to local.conf too, then when the board boot up, to find /usr/share/examples/multimedia/video/qmlvideo