5.1-release will have an enhanced Synaptics/ALPS driver. Meanwhile, the trackpad should behave as at least a mouse for you. If you can't wait until May of next year, you could install -current, as long as you understand all of the implications (most of which are discussed in FAQ 5 and FAQ 15).
Bluetooth has a limited tools suite on OpenBSD, primarily for BT modems.
If the camera is using webcam standards, then yes, it'll work.
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