I have a pending personal injury claim from a wreck with a truck. I think someone is following me around and photographing or videoing my activities. Can insurance companies do that?
Yes, within certain limits. It is not uncommon for insurance companies to use surveillance to determine what task you can perform. The private investigators look to "catch" you performing sports activities, yard work and other physical labor that they say is inconsistent with the limitations and physical injuries you are claiming in litigation.
This is something that you need to discuss with your lawyer as soon as possible.