The Supporting Family Caregivers with Technology trial tested the FamTechCare video support intervention against telephone support. Dementia caregivers' video-recorded challenging care encounters and an interdisciplinary team provided tailored feedback. This paper reports on the effects of the intervention on caregiver confidence in managing priority challenges, a secondary outcome of this non-blinded parallel randomized controlled trial. Caregiver/person living with dementia dyads were randomized to the experimental FamTechCare video support (n = 43) or attention control telephone support (n = 41) groups. Caregivers providing in-home care to a person living with mild or more severe dementia were eligible. Caregivers identified three priority challenges using the Caregiver Target Problems Questionnaire and rated the frequency and severity of each challenge and their confidence managing the challenge at baseline and 3-months. Challenges were classified using the FamTechCare Technology-supported Dementia Care Typology. Effects on confidence were compared between groups using the Wilcoxon rank-sum test and within groups using the Wilcoxon signed-rank test. Caregiver priority challenges included managing dementia behaviors, understanding disease expectations, and performing activity of daily living care. Improvements were observed across the three categories in both groups; however, not all changes were statistically significant. No significant differences were identified between groups. Caregivers in the FamTechCare group reported benefit across all priority challenges including managing dementia behaviors, understanding disease expectations, and performing activity of daily living care. Innovative technology provides new opportunities to support family caregivers in dementia home care. Video-recording can be used to enhance support for family caregivers facing care challenges.