I have a HF G40 and I video plays sometimes. I normally used the auto setting (I'm kinda a novice and when I tried Cinema setting I didn't like the quality) but when someone is spotlighted unless I zoom in pretty tight they are almost a ball of light. Please help with this issue because I really like this camera especially the low light videos.
For difficult lighting situations you need to use manual exposure. I would suggest you have a good read of the user manual. This is a link for the European Legria version. The Canon USA website will have the Vixia version.