Image acquisition package
There is not release package yet but if you can get the source here 
Using v4l2loopback for tests
If you don't have a v4l2 device but test the package you could create a loopback device:
modprobe v4l2loopback gst-launch-0.10 videotestsrc ! v4l2sink device=/dev/video0
Please install v4l2-ctl (for example from Debian package v4l-utils), run the following commands and attach the output.
$ v4l2-ctl -w --list-devices $ v4l2-ctl -w -D $ v4l2-ctl -w -L $ v4l2-ctl -w -n $ v4l2-ctl -w --list-formats
Enable libv4l2 logging:
$ export LIBV4L2_LOG_FILENAME=libv4l2_debug.log
Start octave and execute your commands/scripts which show the problem.
Please include the whole octave session beginning with the start of octave. There might be some warnings like "warning: function xyz shadows a built-in function" at start.
Exit octave and add libv4l2_debug.log to your bug report
Consider running the included tests:
test @videoinput/videoinput test @videoinput/get test @videoinput/set test @videoinput/getsnapshot