There are multiple resolutions which claim to be, or at least to display at 16:9, with varying values of truth. Projectors are notorious for their range of resolutions, e.g. see
http://www.projectorcentral.com/format_resolution.htm
High definition (HDTV) formats use 1,920x1,080 pixels or 1,280x720 for 16:9
It might be better to read the specification sheet for your video camera, or get the resolution from a video/multimedia player that is playing a sample from the videocam.
For NTSC DVD format, a common 16:9 resolution is 720x480 - which isn't really 16:9, but basically only 405 lines get used for non-anamorphic 16:9. However, if the video uses anamorphic non-square pixels the full 720x480 is "stretched" to fit a 16:9 ratio - for a decent not-so-technical explanation, see
http://www.maxent.org/video/16x9.html
For PAL DVD, 16:9 is supported within a resolution of 720x576.
Does normal video from your camera look tall and skinny when played back on the computer screen, but okay when viewed on a 16:9 TV screen?
That's the anamorphic effect. The DVD has a "flag" saying "I'm 16:9 anamorphic" and the DVD player stretches the video signal appropriately.
However, Moho doesn't have an anamorphic render option - you may have to render at about 853x480 (assuming you are using NTSC), then resize the video down to 720x480, making all your Moho scenes and characters look tall and skinny (compressed horizontally) so they are stretched to normal shape when treated as anamorphic video.
All my information comes from reading - I have never yet worked with anamorphic video. Someone please step in and correct me if I've got anything (or just about everything) wrong.
Regards, Myles.